Add Shirtstarter to examples of production apps.

Shirtstarter is 100% built on React.
Merge the lists of JSX integrations in the docs.

There were these two lists of JSX tools at Complimentary Tools
and Tooling Integration, that were a bit out of sync with each other.

Bring them together and add a link to the former from the latter.
Add missing backtick in complementary-tools.md
Add thinking in react to the official docs
fix
[docs] Add more words to downloads page
Update 08-tooling-integration.md

emacs compatibility