🛂 docs: fill correct callback urls for authelia OIDC (#171)

Fix documentation of authelia OIDC integration by:
- improve docker run command with '--rm'
- switch to newer yaml syntax for authelia identity provider definition
- fill correct OPENID_ISSUER and OPENID_CALLBACK_URL in dotenv file

Co-authored-by: Danny Avila <danny@librechat.ai>

pages/docs/configuration/authentication/OAuth2-OIDC/authelia.mdx

@@ -7,22 +7,22 @@ description: Learn how to configure LibreChat to use Authelia for user authentic
 
 - Generate a client secret using:
   ```
-  docker run authelia/authelia:latest authelia crypto hash generate pbkdf2 --variant sha512 --random --random.length 72 --random.charset rfc3986
+  docker run --rm authelia/authelia:latest authelia crypto hash generate pbkdf2 --variant sha512 --random --random.length 72 --random.charset rfc3986
   ```
 - Then in your `configuration.yml` add the following in the oidc section:
   ```bash filename="configuration.yml"
-    - id: librechat
-      description: LibreChat
-      secret: '$pbkdf2-GENERATED_SECRET_KEY_HERE'
+    - client_id: 'librechat'
+      client_name: 'LibreChat'
+      client_secret: '$pbkdf2-GENERATED_SECRET_KEY_HERE'
       public: false
-      authorization_policy: two_factor
+      authorization_policy: 'two_factor'
       redirect_uris:
         - 'https://LIBRECHAT.URL/oauth/openid/callback'
       scopes:
-        - openid
-        - profile
-        - email
-      userinfo_signing_algorithm: none
+        - 'openid'
+        - 'profile'
+        - 'email'
+      userinfo_signing_algorithm: 'none'
   ```
 - Then restart Authelia
 
@@ -32,13 +32,13 @@ description: Learn how to configure LibreChat to use Authelia for user authentic
   ```bash filename=".env"
   ALLOW_SOCIAL_LOGIN=true
   OPENID_BUTTON_LABEL='Log in with Authelia'
-  OPENID_ISSUER=https://auth.example.com
+  OPENID_ISSUER=https://auth.example.com/.well-known/openid-configuration
   OPENID_CLIENT_ID=librechat
   OPENID_CLIENT_SECRET=ACTUAL_GENERATED_SECRET_HERE
   OPENID_SESSION_SECRET=ANY_RANDOM_STRING
-  OPENID_CALLBACK_URL=https://auth.example.com/api/oidc/authorization
+  OPENID_CALLBACK_URL=/oauth/openid/callback
   OPENID_SCOPE="openid profile email"
-
+  OPENID_IMAGE_URL=https://www.authelia.com/images/branding/logo-cropped.png
   # Optional: redirects the user to the end session endpoint after logging out
   OPENID_USE_END_SESSION_ENDPOINT=true 
   ```