added installation of repository in documentation.yml

needed to build run_scripts documentation

Author: ray-chew

.github/workflows/documentation.yml

@@ -20,6 +20,7 @@ jobs:
         run: |
           pip install -r requirements.txt
           pip install sphinx furo sphinx-changelog sphinx-math-dollar
+          pip install .
       - name: Sphinx build
         run: |
           sphinx-build docs/source _build