Setup Github publishing actions and PyPI with Jupyter Server Bot.

[Zsailer]

We should take advantage of the great work happening in Jupyter Releaser.

We can the Jupyter Server Bot to publish directly from this repo.

• Add the Github Jupyter Server Bot as a maintainer on this repo
• Add the PyPI Jupyter Server Bot as a maintainer on the PyPI repo.
• Set up the ADMIN_GITHUB_TOKEN to use the Bot's token.