Revert "feat: D & D による上位タグ設定（#184） (#186)"

This reverts commit 5f306b04b8.

frontend/package.json

@@ -11,8 +11,6 @@
     "preview": "vite preview"
   },
   "dependencies": {
-    "@dnd-kit/core": "^6.3.1",
-    "@dnd-kit/utilities": "^3.2.2",
     "@fontsource-variable/noto-sans-jp": "^5.2.9",
     "@radix-ui/react-dialog": "^1.1.14",
     "@radix-ui/react-switch": "^1.2.5",