updated update-doc.yml workflow

Author: LorenzoTettamanti

.github/workflows/update-doc.yml

@@ -20,6 +20,7 @@ jobs:
       - name: Install mkdocs
         run: |
           pip install mkdocs mkdocs-material
+          pip install mkdocs-rss-plugin
 
       - name: Build documentation
         run: mkdocs build