docs: Add Delegation page (#1414)

Reviewed-on: https://forgejo.ellis.link/continuwuation/continuwuity/pulls/1414
Reviewed-by: Jade Ellis <jade@ellis.link>
Reviewed-by: Jacob Taylor <aranjedeath@noreply.forgejo.ellis.link>
Co-authored-by: stratself <stratself@proton.me>
Co-committed-by: stratself <stratself@proton.me>

docs/_meta.json

@@ -34,6 +34,11 @@
         "name": "troubleshooting",
         "label": "Troubleshooting"
     },
+    {
+        "type": "dir",
+        "name": "advanced",
+        "label": "Advanced"
+    },
     "security",
     {
         "type": "dir-section-header",