Release 0.2.0a0

[bollwyvl]

• merge all outstanding PRs
  • Support JupyterLab 4 and Notebook 7 #54
• ensure the versions have been bumped (check with doit)
• ensure the CHANGELOG is up-to-date
  • move the new release to the top of the stack
• validate on binder
• validate on ReadTheDocs
• wait for a successful build of main
• download the dist archive and unpack somewhere (maybe a fresh dist)
• create a new release through the GitHub UI
  • paste in the relevant CHANGELOG entries
  • upload the artifacts
• actually upload to npm.com, pypi.org

  cd dist
  twine upload *.tar.gz *.whl
  npm login
  npm publish deathbeds-jupyterlab-deck-$VERSION.tgz
  npm logout

• postmortem
  • handle conda-forge feedstock tasks
    • jupyterlab-deck 0.2.0a0 conda-forge/jupyterlab-deck-feedstock#4
    • https://github.com/conda-forge/jupyterlab-deck-feedstock/runs/18065578072
  • validate on binder via simplest-possible gists
    • 
  • Postmortem for 0.2.0a0 #58
    • bump to next development version
    • bump the CACHE_EPOCH
    • rebuild yarn.lock
    • update release procedures with lessons learned