EOSdash: Enable EOS configuration by EOSdash. (#477)

Improve config page to edit actual configuration used by EOS.
Add admin page to save the actual configuration to the configuration file.

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

docs/_generated/openapi.md

@@ -430,7 +430,13 @@ Returns:
 **Request Body**:
 
 - `application/json`: {
-  "description": "The value to assign to the specified configuration path.",
+  "anyOf": [
+    {},
+    {
+      "type": "null"
+    }
+  ],
+  "description": "The value to assign to the specified configuration path (can be None).",
   "title": "Value"
 }