Bikeshed infrastructure

[ivirshup]

Starting bike shed infrastructure.

This is based on the setup of https://github.com/ome/ngff.

The github action won't run until this is merged (so it's a little hard to check if it worked). But it will run without needing maintainer approval in the future.

Things I'm intentionally leaving undone:

• Deploying the version on main. We'd need somewhere to deploy it to. Github pages could work, but I think this would need to be setup by an org owner.
• Filling in text – I'm thinking we can do a skeleton, then PR in text once CI is up

[BenBrock]

Looks good! Is this ready to merge?