fix docs gh action

Author: c0rychu

.github/workflows/docs.yml

@@ -25,5 +25,6 @@ jobs:
           path: ~/.cache 
           restore-keys: |
             mkdocs-material-
+      - run: pip install -e .
       - run: pip install mkdocs-material mkdocstrings[python]
       - run: mkdocs gh-deploy --force