Enable SPA behavior on github pages.

Author: nbonfils

.github/workflows/esbuild.yml

@@ -35,6 +35,8 @@ jobs:
         run: npm ci
       - name: Build with esbuild
         run: npm run build
+      - name: Enable SPA behavior
+        run: cp dist/index.html dist/404.html
       - name: Setup Pages
         uses: actions/configure-pages@v3
       - name: Upload artifact