Update ci.yml

Author: stevsmit

.github/workflows/ci.yml

@@ -20,4 +20,5 @@ jobs:
           path: .cache
       - run: pip install mkdocs-material
       - run: pip install mkdocs-swagger-ui-tag
+      - run: pip install "mkdocs-material[imaging]"
       - run: mkdocs gh-deploy --force