💚 Fix Netlify build with pipenv

scripts/netlify-docs.sh

@@ -1,3 +1,7 @@
 #!/usr/bin/env bash
-
-$HOME/python$PIPENV_RUNTIME/bin/pipenv run -- mkdocs build
+# Install pipenv to be able to install from Pipfile
+pip install pipenv
+# Install Pipfile including --dev, to install mkdocs and plugins
+pipenv install --dev
+# Finally, run mkdocs
+mkdocs build