really fix the RTD build

Author: gipert

Diff for: .readthedocs.yaml

@@ -17,6 +17,8 @@ build:
       --module-first
       --force
       --output-dir docs/source/api
-      scripts
+      workflow/scripts
+      workflow/src
+      workflow/rules
     - .venv/bin/python -m sphinx -T -b html -d docs/_build/doctrees -D
       language=en docs/source $READTHEDOCS_OUTPUT/html