Check for dead links

Author: janhohenheim

.github/workflows/ci.yml

@@ -21,6 +21,8 @@ jobs:
       with:
         args: '.'
         config: '.markdownlint.json'
+    - name: Check for dead links
+      uses: gaurav-nelson/github-action-markdown-link-check@v1
     - name: Install Zola
       run: curl -L ${BASE_URL}/${VERS}/zola-${VERS}-${ARCH}.tar.gz | tar -xz
     - run: ./zola --version