Lists API client bindings/libraries/wrappers and makes a distinction
between official core projects and community projects.
Tweaked by tabbott to sort the community and outdated libraries, and
restructure how we talk about other projects.
Fixes#2093.
This commit allows for the /api-new/ page to rendered similarly to our
/help pages. It's based on the old content for /api, but we're not
replacing the old content yet, to give a bit of time to restructure
things reasonably.
Tweaked by eeshangarg and tabbott.