Update mkdocs configuration path

Author: MishimaHaruna

.github/workflows/docs.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v3
       - run: pip install mkdocs mkdocs-material
       - run: cd docs
-      - run: mkdocs build -f docs/mkdocs.yml
+      - run: mkdocs build -f mkdocs.yml
       - name: Upload GitHub Pages artifact
         uses: actions/upload-pages-artifact@v1.0.8
         with: