complete i18n migration to /[locale]/ with EN+ES content

Full rewrite of the docs site under app/[locale]/ with next-intl
in localePrefix:"always" mode. Every page now exists at both
/en/<path> and /es/<path>; the root / shows a meta-refresh + JS
redirect to /<defaultLocale>/ so GitHub Pages serves something
on the apex URL.

Highlights:
- 107 doc pages migrated to file-per-page JSON namespaces under
  messages/en/ and messages/es/. Spanish content is fully
  translated (no copy-of-English placeholders).
- New documentation for the Active Suppressions section in the
  Settings tab and the per-event Dismiss dropdown in the Health
  Monitor modal.
- New screenshots: dismiss-duration-dropdown.png and an updated
  health-suppression-settings.png.
- Pagefind integrated for client-side search; index is built on
  every CI deploy (not committed).
- RSS feeds: per-locale at /<locale>/rss.xml plus root /rss.xml
  for backward compat.
- Removed the dead app/[locale]/guides/[slug]/ route — every
  guide now has its own static page and no markdown source
  remains.
- Fixed orphan link /guides/nvidia -> /guides/nvidia-manual in
  docs/hardware/nvidia-host.
- Removed obsolete components (footer2, calendar, drawer).

Verified locally with `npm ci && npm run build`: 2804 files in
out/, 231 pages indexed by pagefind, root redirect intact, both
locale roots and the new Active Suppressions docs render OK.

web/app/[locale]/guides/linux-resources/page.tsx

@@ -0,0 +1,223 @@
+import type { Metadata } from "next"
+import Link from "next/link"
+import { BookOpen, ExternalLink, Shield, Activity, Database, FileCode, ArrowLeft } from "lucide-react"
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
+import Footer from "@/components/footer"
+
+export const metadata: Metadata = {
+  title:
+    "Linux & Proxmox Learning Resources — Cheatsheets, Security, ZFS, Monitoring | ProxMenux",
+  description:
+    "Curated catalogue of external Linux and Proxmox VE learning resources: command-line cheatsheets (TLDR, Explainshell, Cheat.sh), security hardening references, monitoring tools and ZFS documentation. Complements the ProxMenux command catalog.",
+  keywords: [
+    "linux cheatsheet",
+    "proxmox learning resources",
+    "linux security hardening",
+    "zfs documentation",
+    "tldr pages",
+    "explainshell",
+    "linux command reference",
+    "linux monitoring tools",
+    "proxmox community resources",
+  ],
+  alternates: { canonical: "https://proxmenux.com/guides/linux-resources" },
+  openGraph: {
+    title: "Linux & Proxmox Learning Resources",
+    description:
+      "Curated external Linux and Proxmox VE learning resources — cheatsheets, security, monitoring, ZFS — that complement the ProxMenux command catalog.",
+    type: "article",
+    url: "https://proxmenux.com/guides/linux-resources",
+    siteName: "ProxMenux",
+    images: [
+      {
+        url: "https://raw.githubusercontent.com/MacRimi/ProxMenux/main/web/public/main.png",
+        width: 1363,
+        height: 735,
+        alt: "Linux & Proxmox Learning Resources — ProxMenux",
+      },
+    ],
+  },
+  twitter: {
+    card: "summary",
+    title: "Linux & Proxmox Learning Resources | ProxMenux",
+    description:
+      "Curated external resources — cheatsheets, security, monitoring, ZFS — that complement the ProxMenux command catalog.",
+  },
+}
+
+export default function LinuxResourcesPage() {
+  const resourceCategories = [
+    {
+      title: "Linux General",
+      icon: <BookOpen className="h-6 w-6 text-blue-500" />,
+      resources: [
+        {
+          title: "TLDR Pages",
+          url: "https://tldr.sh/",
+          description:
+            "Terminal commands explained briefly with practical examples. Ideal for quickly remembering how to use tar, find, rsync, etc.",
+        },
+        {
+          title: "Explainshell",
+          url: "https://explainshell.com/",
+          description:
+            "Enter a command and this site breaks it down explaining each part. Very useful for learning complex commands.",
+        },
+        {
+          title: "Cheat.sh",
+          url: "https://cheat.sh/",
+          description:
+            "Online service to quickly search commands from browser or terminal (curl cheat.sh/tar). Very powerful and practical.",
+        },
+      ],
+    },
+    {
+      title: "Security and Administration",
+      icon: <Shield className="h-6 w-6 text-blue-500" />,
+      resources: [
+        {
+          title: "SSH Hardening Guide",
+          url: "https://www.ssh.com/academy/ssh/security",
+          description:
+            "Advanced guide to secure SSH access. Covers ciphers, versions, authentication, and other recommended practices.",
+        },
+        {
+          title: "Fail2ban Wiki (GitHub)",
+          url: "https://github.com/fail2ban/fail2ban/wiki",
+          description: "Official documentation and usage examples for Fail2ban, an essential tool for servers.",
+        },
+      ],
+    },
+    {
+      title: "Monitoring and Diagnostics",
+      icon: <Activity className="h-6 w-6 text-blue-500" />,
+      resources: [
+        {
+          title: "nmon Performance Monitor",
+          url: "http://nmon.sourceforge.net/pmwiki.php",
+          description: "Advanced system monitoring tool, with documentation on its usage.",
+        },
+        {
+          title: "htop Official",
+          url: "https://htop.dev/",
+          description: "Official page of htop, one of the most used tools for viewing processes and resource usage.",
+        },
+      ],
+    },
+    {
+      title: "ZFS and Storage",
+      icon: <Database className="h-6 w-6 text-blue-500" />,
+      resources: [
+        {
+          title: "OpenZFS Documentation",
+          url: "https://openzfs.github.io/openzfs-docs/",
+          description:
+            "Official and modern guide on ZFS, ideal for administrators using Proxmox with this file system.",
+        },
+        {
+          title: "ZFS Cheatsheet (DigitalOcean)",
+          url: "https://www.digitalocean.com/community/tutorials/how-to-use-zfs-on-ubuntu-20-04",
+          description: "Clear and simple explanation of basic ZFS usage in Linux.",
+        },
+      ],
+    },
+    {
+      title: "Extra: General Cheatsheets",
+      icon: <FileCode className="h-6 w-6 text-blue-500" />,
+      resources: [
+        {
+          title: "OverAPI.com",
+          url: "https://overapi.com/linux",
+          description: "Collection of interactive cheatsheets on multiple technologies, including Linux commands.",
+        },
+        {
+          title: "DevHints.io Linux",
+          url: "https://devhints.io/bash",
+          description:
+            "Bash shortcuts and basic scripting, useful for automating tasks in Proxmox and other environments.",
+        },
+      ],
+    },
+  ]
+
+  return (
+    <div className="min-h-screen bg-white text-gray-900">
+      <div className="container mx-auto px-4 py-16" style={{ maxWidth: "980px" }}>
+        <div className="mb-8">
+          <Link href="/guides" className="flex items-center text-blue-500 hover:text-blue-700 transition-colors mb-6">
+            <ArrowLeft className="mr-2 h-4 w-4" />
+            Back to Guides
+          </Link>
+
+          <h1 className="text-4xl font-bold mb-4 text-black">Linux Resources</h1>
+
+          <p className="text-lg mb-8 text-gray-700">
+            A collection of useful resources for learning Linux commands, security practices, monitoring tools, and
+            more. These resources complement the commands available in ProxMenux and will help you deepen your knowledge
+            of Linux system administration.
+          </p>
+        </div>
+
+        <div className="space-y-10 mb-16">
+          {resourceCategories.map((category, index) => (
+            <div key={index} className="mb-8">
+              <div className="flex items-center gap-3 mb-4">
+                {category.icon}
+                <h2 className="text-2xl font-bold text-black">{category.title}</h2>
+              </div>
+
+              <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
+                {category.resources.map((resource, resourceIndex) => (
+                  <ResourceCard key={resourceIndex} resource={resource} />
+                ))}
+              </div>
+            </div>
+          ))}
+        </div>
+      </div>
+      <Footer />
+    </div>
+  )
+}
+
+interface ResourceProps {
+  resource: {
+    title: string
+    url: string
+    description: string
+  }
+}
+
+function ResourceCard({ resource }: ResourceProps) {
+  return (
+    <Card className="transition-all duration-300 hover:shadow-md hover:border-blue-300 bg-white text-black border-2 border-gray-200">
+      <CardHeader className="pb-2">
+        <CardTitle className="text-xl text-black flex items-center justify-between">
+          {resource.title}
+          <a
+            href={resource.url}
+            target="_blank"
+            rel="noopener noreferrer"
+            className="text-blue-500 hover:text-blue-700"
+            aria-label={`Visit ${resource.title} (opens in a new window)`}
+          >
+            <ExternalLink className="h-5 w-5" />
+          </a>
+        </CardTitle>
+      </CardHeader>
+      <CardContent>
+        <CardDescription className="text-base text-gray-600">{resource.description}</CardDescription>
+        <div className="mt-4">
+          <a
+            href={resource.url}
+            target="_blank"
+            rel="noopener noreferrer"
+            className="text-sm text-blue-500 hover:text-blue-700 flex items-center"
+          >
+            Visit resource <ExternalLink className="ml-1 h-3 w-3" />
+          </a>
+        </div>
+      </CardContent>
+    </Card>
+  )
+}