Migration to new documentation and information site

documentation/docs/configuration/disable_registration.md

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+# Disable Registration
+
+To disable registration, you can set the following variable in your docker-compose.yml under the server service:
+
+```yaml
+environment:
+  - DISABLE_REGISTRATION=True
+  # OPTIONAL: Set the message to display when registration is disabled
+  - DISABLE_REGISTRATION_MESSAGE='Registration is disabled for this instance of AdventureLog.'
+```