refactor: update database setup and remove skills migration API

- Changed migration commands in DATABASE_SETUP.md to use `pnpm run sync-skills` and `pnpm run sync-teams`.
- Removed the skills migration API endpoint in route.ts, streamlining the migration process.
- Updated MIGRATION_UUID.md to reflect changes in migration steps and removed the old skills migration script.
- Added new sync scripts for skills and teams in package.json.
- Cleaned up init.sql by removing old teams data insertion and adjusted comments for clarity.

package.json

@@ -7,7 +7,9 @@
     "dev": "next dev",
     "lint": "next lint",
     "start": "next start",
-    "generate-test-data": "tsx scripts/generate-test-data.ts"
+    "generate-test-data": "tsx scripts/generate-test-data.ts",
+    "sync-skills": "tsx scripts/sync-skills.ts",
+    "sync-teams": "tsx scripts/sync-teams.ts"
   },
   "dependencies": {
     "@fortawesome/fontawesome-svg-core": "^7.0.0",