docs(about us): add new contributor, and credit MkDocs and Material for MkDocs

[HonkingGoose]

Changes

Honor some valuable contributions:

• @not7cd for their work on the pip-compile manager
• @squidfunk for making and maintaining Material for MkDocs, and for helping us out with our docs
• The MkDocs project for making the static site generator we use to publish the docs

And:

• Add MkDocs and Material for MkDocs to the "About these docs" section

Context

Time to update the contributions again. @not7cd started contributing a lot, mostly on the pip-compile manager.

The Material for MkDocs maintainer deserves credit, because they make the docs framework, and helped us when we have problems with the docs. ❤️

In the same vein, the MkDocs project deserves credit, because they make and maintain the static site generator we use.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 37.316.2 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 37.316.2

Your semantic-release bot 📦🚀