fix(workflow): Specify custom config file for mkdocs gh-deploy command

Author: codeboyzhou

.github/workflows/deploy-docs.yml

@@ -27,4 +27,4 @@ jobs:
           restore-keys: |
             mkdocs-material-
       - run: pip install mkdocs-material
-      - run: mkdocs gh-deploy --force
+      - run: mkdocs gh-deploy --force --config-file docs/mkdocs.yml