Add documentation on how to integrate SilverBullet with Authelia (#448)

website/Authelia.md

@@ -0,0 +1,26 @@
+# How to setup SilverBullet with Authelia
+In order for SilverBullet to work as intended, some files will need to be excluded from your authentication method of choice. These files need to always be accessible, for example for offline or [[PWA]] support.
+
+The files are the following:
+- The web manifest
+- The app icon
+- The service worker
+
+These files can be whitelisted by adjusting your Authelia configuration to something like this:
+
+```yaml
+access_control:
+  default_policy: deny
+  
+  rules:
+    - domain: silverbullet.yourdomain.com
+      resources:
+        - '/.client/manifest.json$'
+        - '/.client/[a-zA-Z0-9_-]+.png$'
+        - '/service_worker.js$'
+      policy: bypass
+    - domain: yourdomain.com
+      policy: two_factor
+```
+
+Please adjust this to fit your specific needs. The important part is that the files are associated with `policy: bypass`.

website/Install.md

@@ -112,4 +112,7 @@ You can configure SB with environment variables instead of flags as well. The fo
 * `SB_USER`: Sets single-user credentials (like `--user`), e.g. `SB_USER=pete:1234`
 * `SB_PORT`: Sets the port to listen to, e.g. `SB_PORT=1234`
 * `SB_FOLDER`: Sets the folder to expose, e.g. `SB_FOLDER=/space`
-* `SB_AUTH`: Loads an [[Authentication]] database from a (JSON encoded) string, e.g. `SB_AUTH=$(cat /path/to/.auth.json)`
+* `SB_AUTH`: Loads an [[Authentication]] database from a (JSON encoded) string, e.g. `SB_AUTH=$(cat /path/to/.auth.json)`
+
+## Using Authelia
+You need to adjust a few configuration options in [[Authelia]] in order for SilverBullet to work as intended.