Use requirements

Author: finsberg

.github/workflows/build_docs.yml

@@ -25,7 +25,7 @@ jobs:
           python-version: "3.10"
 
       - name: Install dependencies
-        run: python3 -m pip install ".[docs]"
+        run: python3 -m pip install -r requirements.txt
 
       - name: Build docs
         run: jupyter-book build -W --keep-going .