Fix workflow: build MkDocs site before deploying

Author: waqasm86

.github/workflows/static.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with:
-          path: '.'
+          path: 'site/'
 
       - name: Deploy to GitHub Pages
         id: deployment