Release instructions

1. Get all the key changes merged into main.
2. Update all relevant versions in Cargo.tomls. Commit the changes to the release branch of this repository (not a fork).
3. Create a new PR labeled release. The title of the PR should be the new version tag (e.g., v1.2.3), this tag should also be the only text in the PR body. Filing this PR will immediately start the release process.
4. If the release works, then merge and you're good.

Note: if you change the toolchain or otherwise make breaking changes, you may need to update the mdbook-aquascope dependency in mdbook-quiz!