Cleanup: remove frontend, move JSONs to json/ top-level (#12813)

json/ubuntu.json

@@ -0,0 +1,35 @@
+{
+  "name": "Ubuntu",
+  "slug": "ubuntu",
+  "categories": [
+    2
+  ],
+  "date_created": "2024-05-02",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": null,
+  "documentation": null,
+  "website": "https://ubuntu.com/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/ubuntu.webp",
+  "config_path": "",
+  "description": "Ubuntu is a distribution based on Debian, designed to have regular releases and a consistent user experience.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/ubuntu.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 512,
+        "hdd": 2,
+        "os": "ubuntu",
+        "version": "24.04"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": []
+}