docs: add documentation for template update policies (#10804)

Co-authored-by: Ben Potter <ben@coder.com>

docs/manifest.json

@@ -210,6 +210,23 @@
             }
           ]
         },
+        {
+          "title": "Administering templates",
+          "description": "Configuration settings for template admins",
+          "path": "./templates/configuration.md",
+          "children": [
+            {
+              "title": "General settings",
+              "description": "Configure name, display info, and update polices",
+              "path": "./templates/general-settings.md"
+            },
+            {
+              "title": "Permissions",
+              "description": "Configure who can access a template",
+              "path": "./templates/permissions.md"
+            }
+          ]
+        },
         {
           "title": "Open in Coder",
           "description": "Add an \"Open in Coder\" button to your repos",