Remove Docusaurus API reference generator

Replaced by the mkdocs-material site published to
python.durable-workflow.com, which generates the reference directly
from docstrings on every push to main.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: durable-workflow-ops

README.md

@@ -148,11 +148,13 @@ mypy src/durable_workflow/
 # Lint
 ruff check src/ tests/
 
-# Regenerate the docs-site API reference
-python scripts/generate-api-reference.py \
-  --output ../durable-workflow.github.io/docs/polyglot/python-api-reference.md
+# Preview the API reference site locally
+pip install -e '.[docs]'
+mkdocs serve
 ```
 
+The API reference is published to [python.durable-workflow.com](https://python.durable-workflow.com/) and rebuilt automatically on push to `main`.
+
 ## License
 
 MIT