Add presubmit to build site for each pr.

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+---
+name: Build static site
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Build with next.js
+        run: npm run build

package.json

@@ -8,7 +8,6 @@
     "build": "next build",
     "export": "next export",
     "deploy": "gh-pages -d out -t true",
-    "serve": "next start",
     "analyze": "cross-env ANALYZE=true next build",
     "lint": "next lint --fix --dir pages --dir components --dir lib --dir layouts --dir scripts",
     "prepare": "husky install",