Release 0.5.0a0

[bollwyvl]

• [x] merge all outstanding PRs
• [x] ensure the versions have been bumped (check with doit)
• [x] ensure HISTORY.ipynb is up-to-date
  • [x] move the new release to the top of the stack
• [ ] validate on binder
• [x] validate on ReadTheDocs
• [x] wait for a successful build of main
• [x] download the dist archive and unpack somewhere (maybe a fresh dist)
• [x] create a new release through the GitHub UI
  • [x] paste in the relevant HISTORY.ipynb entries
  • [x] upload the artifacts
• [x] actually upload to pypi.org

  cd dist
  twine upload *.tar.gz *.whl

• [ ] postmortem
  • [x] https://github.com/robots-from-jupyter/robotframework-jupyterlibrary/pull/75
  • [x] handle conda-forge feedstock tasks
  • [x] https://github.com/conda-forge/robotframework-jupyterlibrary-feedstock/pull/6
  • [x] https://anaconda.org/conda-forge/robotframework-jupyterlibrary/files?version=0.5.0a0
  • [ ] validate on binder via simplest-possible gists
  • [x] bump to next development version
  • [ ] rebuild yarn.lock
  • [x] update release procedures with lessons learned