Added missing call to gh-deploy

Author: snvgglebear

.github/workflows/Deploy_site.yml

@@ -30,4 +30,5 @@ jobs:
         with:
           python-version: 3.x
       - run: pip install mkdocs
-      - run: pip install -r requirements.txt
+      - run: pip install -r requirements.txt
+      - run: mkdocs gh-deploy --force