Add markdown formatting and link checking workflow

.github/workflows/markdown-format.yml

@@ -0,0 +1,33 @@
+name: Markdown Format Check
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '**/*.md'
+      - '**/*.mdx'
+  pull_request:
+    paths:
+      - '**/*.md'
+      - '**/*.mdx'
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Check markdown formatting
+        run: npm run check:docs:format
+
+      - name: Check markdown links
+        run: npm run check:docs:links