* chore(deps): upgrade stardoc
This uses the Bazel 7 'starlark_doc_extract' rule which our docsite expects for slurping data.
* chore: stardoc setup in WORKSPACE too
* chore: skip stardoc on bazel 6 in cases where the legacy extractor produces different docstrings
* feat: expose a config_setting for copy execution_requirements
Fixes #604
* chore: add user docs
* chore: improve docs
* chore: better link to copy_file