Update deployment workflow to correctly install dependencies

Author: Rezzorex

.github/workflows/deploy.yml

@@ -29,5 +29,5 @@ jobs:
           path: ~/.cache
           restore-keys: |
             mkdocs-material-
-      - run: pip install mkdocs-material
+      - run: pip install -r dev_requirements.txt
       - run: mkdocs gh-deploy --force