change link checker path to plugins folder

Author: jjw24

.github/workflows/links.yml

@@ -18,6 +18,6 @@ jobs:
         id: lychee
         uses: lycheeverse/lychee-action@v2
         with:
-          args: --verbose --no-progress plugins.json
+          args: --verbose --no-progress plugins/*.json
           fail: true
           token: ${{ secrets.LINKCHECKER }}