Adding installation of autoemulate to docs

.github/workflows/docs.yaml

@@ -15,6 +15,8 @@ jobs:
               run: pip install --upgrade pip
             - name: "Install jupyterbook"
               run: pip install -r docs/requirements.txt
+            - name: "Install autoemulate"
+              run: pip install git+https://github.com/alan-turing-institute/autoemulate.git
             - name: "Run jupyterbook"
               run: jupyter-book build docs --all
             - name: "Deploy"