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/docker.json

@@ -0,0 +1,59 @@
+{
+  "name": "Docker",
+  "slug": "docker",
+  "categories": [
+    3
+  ],
+  "date_created": "2024-05-02",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": null,
+  "documentation": null,
+  "website": "https://www.docker.com/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/docker.webp",
+  "config_path": "",
+  "description": "Docker is an open-source project for automating the deployment of applications as portable, self-sufficient containers.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/docker.sh",
+      "resources": {
+        "cpu": 2,
+        "ram": 2048,
+        "hdd": 4,
+        "os": "debian",
+        "version": "13"
+      }
+    },
+    {
+      "type": "alpine",
+      "script": "ct/alpine-docker.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 1024,
+        "hdd": 2,
+        "os": "alpine",
+        "version": "3.23"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "text": "If the LXC is created Privileged, the script will automatically set up USB passthrough.",
+      "type": "warning"
+    },
+    {
+      "text": "Run Compose V2 by replacing the hyphen (-) with a space, using `docker compose`, instead of `docker-compose`.",
+      "type": "warning"
+    },
+    {
+      "text": "Options to Install Portainer and/or Docker Compose V2",
+      "type": "warning"
+    }
+  ]
+}