fix, build: use custom GitHub pages build and deploy workflow

.github/workflows/deploy.yml

@@ -7,17 +7,19 @@ on:
       - master
 
 jobs:
-  deploy:
+  build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/cache@v3
-        with:
-          path: vendor/bundle
-          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile') }}
-          restore-keys: |
-            ${{ runner.os }}-gems-
-      - uses: helaili/jekyll-action@v2
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          target_branch: 'static'
+          ruby-version: '3'
+          bundler-cache: true  # runs 'bundle install' and caches installed gems automatically
+      - run: bundle exec jekyll build
+      - uses: actions/upload-pages-artifact@v3
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/deploy-pages@v4