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/archlinux-vm.json

@@ -0,0 +1,40 @@
+{
+  "name": "Arch Linux",
+  "slug": "archlinux-vm",
+  "categories": [
+    2
+  ],
+  "date_created": "2025-01-27",
+  "type": "vm",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": null,
+  "documentation": "https://wiki.archlinux.org/title/Main_page",
+  "website": "https://archlinux.org/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/arch-linux.webp",
+  "config_path": "",
+  "description": "Arch Linux is a highly customizable, independent Linux distribution that gives users complete control over their system. Known for its rolling release model, Arch Linux is always up-to-date with the latest software. It's favored by experienced users who appreciate its minimalist approach, demanding a hands-on installation and configuration process. This level of control and flexibility makes it a popular choice for those who want to tailor their Linux system to their exact needs.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "vm/archlinux-vm.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 1024,
+        "hdd": 4,
+        "os": null,
+        "version": null
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "text": "doesnt work with lvm and lvmthin disks!",
+      "type": "warning"
+    }
+  ]
+}