Clean up the auth bundle config

Remove everything not strictly needed and avoid using "keycloak"
unless required, since we want to support other ODIC servers in the long
run as well.

.env

@@ -16,17 +16,13 @@
 APP_ENV=dev
 APP_SECRET=
 
-# KEYCLOAK
-KEYCLOAK_SERVER_URL=https://auth.your-server/auth
-KEYCLOAK_REALM=your-realm
-KEYCLOAK_FRONTEND_CLIENT_ID=your-client-id
-# If not empty gets used to check if the access token got issued
-# for this audience ('api-gw' for example)
-KEYCLOAK_AUDIENCE=api-gw
-# Set to true to enable remote access token validation
-KEYCLOAK_REMOTE_VALIDATION=false
-KEYCLOAK_CLIENT_ID=
-KEYCLOAK_CLIENT_SECRET=
+# Auth related
+AUTH_SERVER_URL=https://auth.your-server/auth/realms/your-realm
+# (optional) This allows you to log into the auto generated OpenAPI documentation page
+# which you can see when visiting the server with a browser. Leave empty to disable.
+AUTH_APIDOCS_KEYCLOAK_SERVER=https://auth.your-server/auth
+AUTH_APIDOCS_KEYCLOAK_REALM=your-realm
+AUTH_APIDOCS_KEYCLOAK_CLIENT_ID=api-docs-client-id
 
 # Deployment related
 API_BUILDINFO=unknown  # a git hash or something identifying the build

config/packages/dbp_relay_auth.yaml

 dbp_relay_auth:
-  server_url: '%env(KEYCLOAK_SERVER_URL)%/realms/%env(KEYCLOAK_REALM)%'
-  # Remote validation
-  remote_validation: '%env(bool:KEYCLOAK_REMOTE_VALIDATION)%'
-  remote_validation_id: '%env(KEYCLOAK_CLIENT_ID)%'
-  remote_validation_secret: '%env(KEYCLOAK_CLIENT_SECRET)%'
-  # Frontend
+  server_url: '%env(AUTH_SERVER_URL)%'
+  # OpenAPI Docs Keycloak Settings
+  frontend_keycloak_server: '%env(AUTH_APIDOCS_KEYCLOAK_SERVER)%'
+  frontend_keycloak_realm: '%env(AUTH_APIDOCS_KEYCLOAK_REALM)%'
+  frontend_keycloak_client_id: '%env(AUTH_APIDOCS_KEYCLOAK_CLIENT_ID)%'
\ No newline at end of file
-  frontend_keycloak_server: '%env(KEYCLOAK_SERVER_URL)%'
-  frontend_keycloak_realm: '%env(KEYCLOAK_REALM)%'
-  frontend_keycloak_client_id: '%env(KEYCLOAK_FRONTEND_CLIENT_ID)%'