ci(publish-docs): Install docs via --extras docs

Author: tony

.github/workflows/publish-docs.yml

@@ -60,8 +60,8 @@ jobs:
       shell: bash
       run: poetry run python -m pip install pip -U
 
-    - name: Install dependencies
-      run: poetry install
+    - name: Install dependencies [w/ docs]
+      run: poetry install -E docs
 
     - name: Build documentation
       run: |