Experiment with an html minifier to make site smaller

.github/workflows/jekyll.yml

@@ -42,6 +42,11 @@ jobs:
           bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
         env:
           JEKYLL_ENV: production
+      - name: Minify HTML to make the site as small as possible
+        if: github.event_name != 'pull_request'
+        run: |
+          npm install html-minifier
+          html-minifier --collapse-whitespace --minify-js --minify-css --remove-comments --file-ext html --input-dir _site --output-dir _site
       - name: Upload artifact
         if: github.event_name != 'pull_request'
         uses: actions/upload-pages-artifact@v3