ci: detect broken links using linkspector

.github/workflows/linkspector.yaml

@@ -0,0 +1,22 @@
+name: Linkspector
+on:
+  pull_request:
+jobs:
+  check-links:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    - uses: 1arp/create-a-file-action@0.4.5
+      with:
+        file: .linkspector.yml
+        content: |
+          dirs: ['.']
+          useGitIgnore: true
+          modifiedFilesOnly: true
+    - name: Run Linkspector
+      uses: realiserad/action-linkspector@v1.0.2
+      with:
+        github_token: ${{ secrets.github_token }}
+        reporter: github-pr-review