fix: update GitHub Pages workflow to use latest action versions and build command

Author: ttelang

.github/workflows/github-pages.yml

@@ -30,13 +30,13 @@ jobs:
         run: npm install
 
       - name: Build site
-        run: npx gulp build:preview
+        run: npx gulp github-pages
 
       - name: Setup Pages
-        uses: actions/configure-pages@v3
+        uses: actions/configure-pages@v4
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v3
         with:
           path: './public'
 
@@ -49,4 +49,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v4