Improve admin privilege handling for OAuth. Update documentation.

docs/documentation/getting-started/building.md

@@ -1,5 +1,5 @@
 To build a standalone application, use the Makefile provided in the repository.
-Go version **1.22** or higher has to be installed to build WireGuard Portal.
+Go version **1.23** or higher has to be installed to build WireGuard Portal.
 If you want to re-compile the frontend, NodeJS **18** and NPM >= **9** is required.
 
 ```shell

docs/documentation/getting-started/docker.md

@@ -8,7 +8,7 @@ A sample docker-compose.yml:
 version: '3.6'
 services:
   wg-portal:
-    image: wgportal/wg-portal:v2
+    image: wgportal/wg-portal:latest
     restart: unless-stopped
     cap_add:
       - NET_ADMIN
@@ -64,18 +64,4 @@ You should mount those directories as a volume:
 - /app/data
 - /app/config
 
-### Configuration Options
-All available YAML configuration options are available [here](https://github.com/h44z/wg-portal#configuration).
-
-A very basic example:
-
-```yaml
-core:
-  admin_user: test@wg-portal.local
-  admin_password: secret
-
-web:
-  external_url: http://localhost:8888
-  request_logging: true
-```
-
+A detailed description of the configuration options can be found [here](../configuration/overview.md).

docs/documentation/getting-started/upgrade.md

@@ -22,4 +22,15 @@ For example:
 ```
 
 The upgrade will transform the old, existing database and store the values in the new database specified in the **config.yml** configuration file.
-Ensure that the new database does not contain any data!
+Ensure that the new database does not contain any data!
+
+If you are using Docker, you can adapt the docker-compose.yml file to start the upgrade process:
+
+```yaml
+services:
+  wg-portal:
+    image: wgportal/wg-portal:latest
+    # ... other settings
+    restart: no
+    command: ["-migrateFrom=/app/data/wg_portal.db"]
+```