v20.2.2
admin/build-doc: use venv module again
admin/build-doc: consolidate the build deps into admin/doc-pybind.txt
doc: build mon_command_api.rst using a homebrew extension
doc: Pin pip to <25.3 for RTD as a workaround for pybind
doc: Remove sphinxcontrib-seqdiag Python package from RTD builds
admin/serve-doc: Switch to python3 only