Remove 'invoke' stuff

Author: dmerejkowsky

.github/workflows/doc.yml

@@ -19,14 +19,16 @@ jobs:
       with:
         python-version: "3.10"
 
+    - uses: extractions/setup-just@v1
+
     - name: Install and configure poetry
       run: |
         python -m pip install poetry
 
     - name: Prepare project for development
       run: |
-        python -m poetry install
+        just setup
 
     - name: Build documentation
       run: |
-        poetry run invoke sphinx
+        just build-doc