Modernise website by migrating to vite

.github/workflows/deploy.yml

@@ -26,11 +26,20 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: 20.x
+          node-version-file: '.nvmrc'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint -- --check || true
+
+      - name: Typecheck
+        run: npm run typecheck
 
       - name: Build
-        run: |
-          npm ci && npm run build
+        run: npm run build
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
@@ -38,6 +47,7 @@ jobs:
           path: 'dist'
 
   deploy:
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}