refactor: remove frontend, move JSONs to json/ top-level

- Archive frontend to community-scripts/ProxmoxVE-Frontend-Archive
- Move frontend/public/json/ -> json/
- Update workflow paths in 5 actions:
  - update-versions-github.yml
  - update-json-date.yml
  - push-json-to-pocketbase.yml
  - delete-pocketbase-entry-on-removal.yml
  - autolabeler.yml
- Remove frontend-cicd.yml (no longer needed)
- Clean up .gitignore (remove frontend-specific entries)

json/bookstack.json

@@ -0,0 +1,44 @@
+{
+  "name": "BookStack",
+  "slug": "bookstack",
+  "categories": [
+    12
+  ],
+  "date_created": "2024-11-05",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": 80,
+  "documentation": "https://www.bookstackapp.com/docs/",
+  "website": "https://www.bookstackapp.com/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/bookstack.webp",
+  "config_path": "/opt/bookstack/.env",
+  "description": "BookStack is a user-friendly documentation platform that offers a simple and intuitive experience. New users should be able to create content with basic word-processing skills. While the platform provides advanced features, they do not interfere with the core simplicity of the user experience.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/bookstack.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 1024,
+        "hdd": 4,
+        "os": "debian",
+        "version": "13"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": "admin@admin.com",
+    "password": "password"
+  },
+  "notes": [
+    {
+      "text": "Bookstack works only with static IP. If you change the IP of your LXC, you need to edit the .env file",
+      "type": "warning"
+    },
+    {
+      "text": "To see database credentials, type `cat ~/bookstack.creds` in LXC console",
+      "type": "info"
+    }
+  ]
+}