Add sitemap generator to website for crawling. (#350)

Author: sbryngelson

.github/workflows/docs.yml

@@ -36,6 +36,22 @@ jobs:
         cmake -S . -B build -G Ninja --install-prefix=$(pwd)/build/install -D MFC_DOCUMENTATION=ON
         ninja -C build install
 
+    # From here https://github.com/cicirello/generate-sitemap
+    - name: Generate the sitemap
+      id: sitemap
+      uses: cicirello/generate-sitemap@v1
+      with:
+        base-url-path: https://mflowcode.github.io/
+        path-to-root: build/install/docs
+        include-pdf: false
+        sitemap-format: txt
+
+    - name: Output stats
+      run: |
+        echo "sitemap-path = ${{ steps.sitemap.outputs.sitemap-path }}"
+        echo "url-count = ${{ steps.sitemap.outputs.url-count }}"
+        echo "excluded-count = ${{ steps.sitemap.outputs.excluded-count }}"
+
     - name: Publish Documentation
       run:  |
         set +e