Release notes for 1.6.0

[oprypin]

Preview: https://oprypin.github.io/mkdocs/about/release-notes/#version-160-2024-04-18

I still plan to do another stylistic pass over this, but for now these release notes are ready for anyone who wants to check these changes prior to the release.

PRs still remaining to be merged: https://github.com/mkdocs/mkdocs/milestone/18

[pawamoy]

Thanks @oprypin, both the release notes and the upgraded mkdocs theme look good 👍

[Andre601]

I have to say, the dark mkdocs theme looks great. Really well done.

[tomchristie]

Thanks @oprypin.

Related to this PR... what's the current deploy process for mkdocs releases?

[oprypin]

1. Merge a PR that changes the version in __init__.py (this)
2. Create and push a tag
3. (GitHub Actions automatically pushes to PyPI)
4. mkdocs gh-deploy
5. Publish a "release" on GitHub, with copied release notes but they need to be manually edited so that links go to mkdocs.org

[squidfunk]

Thanks for all your hard work on MkDocs and all the best for your future!