Delete flatnotes (ct) after migration to ProxmoxVE (#1297)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

frontend/public/json/flatnotes.json

@@ -1,35 +0,0 @@
-{
-    "name": "Flatnotes",
-    "slug": "flatnotes",
-    "categories": [
-        12
-    ],
-    "date_created": "2026-01-15",
-    "type": "ct",
-    "updateable": true,
-    "privileged": false,
-    "interface_port": 8080,
-    "documentation": "https://github.com/dullage/flatnotes/wiki",
-    "website": "https://github.com/dullage/flatnotes",
-    "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/flatnotes.webp",
-    "config_path": "/opt/flatnotes/.env",
-    "description": "A self-hosted, database-less note-taking web app that utilises a flat folder of markdown files for storage.",
-    "install_methods": [
-        {
-            "type": "default",
-            "script": "ct/flatnotes.sh",
-            "resources": {
-                "cpu": 1,
-                "ram": 1024,
-                "hdd": 4,
-                "os": "debian",
-                "version": "13"
-            }
-        }
-    ],
-    "default_credentials": {
-        "username": null,
-        "password": null
-    },
-    "notes": []
-}