Convert website to Next.js

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
         uses: peaceiris/actions-gh-pages@v3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./pages/out
+          publish_dir: ./website/out
           cname: immutable-js.com
           user_name: 'github-actions[bot]'
           user_email: 'github-actions[bot]@users.noreply.github.com'

.gitignore

@@ -9,6 +9,9 @@ yarn-error.log
 TODO
 /pages/out
 /pages/generated
+/website/.next
+/website/out
+.next
 /gh-pages
 /npm
 /dist