docs: Stylize announcement, update contributors in README.md

[charlieforward9]

I contributed #96 and want to put my name on the README for Open Source clout.

With more people using the most current version than the outdated version, it also seemed time to restore the face of the README to a cleaner state, with a description of the package under the title and a formatted alert of the package location change following that.

Important

This should be merged asap 🙏 , thanks @mapbox

Shoutout to Github for these cool stylers

CC: @sheindel

[charlieforward9]

@sheindel I would appreciate seeing this merged as it's simply a README modification that improves docs and should not require code review. Its one of my oldest unmerged PRs that I'd like to see finished.

[sheindel]

I'd love to get these in too, but I was removed by mapbox as being in control of the repository. Presumably my access was removed as part of a regular sweep, but they decided not to reinstate it. @chriswhong may be able to help or delegate this but no guarantees as he is quite busy as well and I don't think mapbox actually relies on this library themselves anymore.

[charlieforward9]

Thanks Stephen,

Chris, TLDR: these are non-breaking stylistic updates to docs that I just want to get off my active PR list. Thank you.

Also happy to maintain this repo if needed.