set up new workflow and migrate to .forgejo dir

.forgejo/workflows/deploy.yml

@@ -0,0 +1,25 @@
+name: Deploy
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - uses: pnpm/setup@v1
+        with:
+          version: 11
+          runtime: node@24
+          cache: true
+      - name: Build
+        run: pnpm build
+      - name: Deploy to Netlify
+        run: npx -y netlify-cli deploy --prod --dir=build
+        env:
+          NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
+          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}