Release v1.0.0-beta.0

[CosmicHorror]

Release checklist

1. Create a new "Release v1.0.0-beta.0" issue with this checklist
   • $ cat RELEASE.md | sd '\{VERSION\}' '{NEW_VERSION}' | xclip -sel clip
   • Create the issue in GitHub
2. Regenerate static assets
   • $ cargo xtask gen
3. Update rust-version in Cargo.toml
   • $ cargo msrv --min 1.60 -- cargo check
4. Bump version in Cargo.toml
5. Update the CHANGELOG.md
6. Merge changes through a PR to make sure that CI passes
7. Publish on crates.io
   • $ cargo publish
8. Publish on GitHub by pushing a version tag
   • Make sure the branch you're on is fully up to date
   • $ git tag v1.0.0-beta.0
   • $ git push upstream/origin v1.0.0-beta.0
9. Make a release announcement on GitHub after the release workflow finishes