🌗 Color Modes

[simurai]

⚠️ Don't merge this into master just yet. It will most likely be released as Primer CSS 16.0.0. ⚠️

This PR is only to test changes with a different package name (@primer/css-next) so it can be installed in parallel to @primer/css.

🔍 All PRs merged into color-modes (so far).

How to use this branch

1. Make a PR and change the base branch to color-modes
   • You might wanna branch off from color-modes if your changes are related.
2. When the PR is approved, merge it
3. In dotcom run bin/npm install @primer/css-next@canary
   • Or e.g. bin/npm install @primer/css-next@0.0.0-4467910 if you want to rollback to a previous PR

How to release this branch

Once all the changes from color-modes should be available in @primer/css, do the following:

1. Revert this commit 0ffe77a (renaming the package)
2. Create a new "release" branch, probably release-16.0.0.
3. Change the base branch for this PR to release-16.0.0 -> merge it.
4. Follow the usual RELEASING process.

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[simurai]

Let's keep #1131 as the "long running" branch. Just one big PR might be fine for now and we don't have to go hunt through many smaller PRs.