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

frontend/public/json/slskd.json

@@ -1,40 +0,0 @@
-{
-  "name": "Slskd",
-  "slug": "slskd",
-  "categories": [
-    11
-  ],
-  "date_created": "2025-03-31",
-  "type": "ct",
-  "updateable": true,
-  "privileged": false,
-  "interface_port": 5030,
-  "documentation": "https://github.com/slskd/slskd/tree/master/docs",
-  "website": "https://github.com/slskd/slskd",
-  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/slskd.webp",
-  "config_path": "/opt/slskd/config/slskd.yml",
-  "description": "A modern client-server application for the Soulseek file sharing network. ",
-  "install_methods": [
-    {
-      "type": "default",
-      "script": "ct/slskd.sh",
-      "resources": {
-        "cpu": 1,
-        "ram": 512,
-        "hdd": 4,
-        "os": "Debian",
-        "version": "13"
-      }
-    }
-  ],
-  "default_credentials": {
-    "username": "slskd",
-    "password": "slskd"
-  },
-  "notes": [
-    {
-      "text": "See /opt/slskd/config/slskd.yml to add your Soulseek credentials",
-      "type": "info"
-    }
-  ]
-}