Add releaser workflows to the repo

[jtpio]

References

Similar to https://github.com/jupyterlite/xeus-python-kernel/pull/109.

Using the Voila Bot Account: https://github.com/voila-bot

Code changes

Add releaser workflows to be able to release from the repo directly with the bot account: https://github.com/jupyterlite-bot

• [x] Follow setup from https://jupyter-releaser.readthedocs.io/en/latest/how_to_guides/convert_repo_from_repo.html
• [x] Add voila-bot as a collaborator to the repo
• [x] Add ADMIN_GITHUB_TOKEN to the repo secrets
• [x] Add PYPI_TOKEN to the repo secrets
• [x] Add NPM_TOKEN to the repo secrets
• [x] Update RELEASE.md

User-facing changes

None

Backwards-incompatible changes

None

[jtpio]

Adding this will make it easier for an Admin of the repo to make releases without having to maintain a fork of the releaser.

But you can still use your fork of the releaser if you would like to for making releases (https://jupyter-releaser.readthedocs.io/en/latest/how_to_guides/convert_repo_from_releaser.html).