* Rewrite "adding React to existing app"
Fixes#988
* Some copy
* typo
* Update babel instructions
* Update umd link
* Add prod minification section
* Show "button" example in several targets
* wip
* More
* More
* tweak
* yas
* Multi root tip
* moaar
* alot
* Tweak links
* Explain better
* better lead
* tweaks
* tweaks
* wording
* More reassuring tone
* Grammar
* wording
* feedback from readers
* Use id, not class
* More nits
* Re-add a useful section
* Break out Installation into top-level doc section
* Update navigation (prev/next, nav tree)
- Move Installation section to top
- Add next/prev to install pages
* add links to other install options from try react page
* fix markdown link
* Clarify that Quick Start and Install are optional "next steps"
* Add top-level CDN page
This is useful for Codepen and other Unpkg-y setups
* Add link to Tutorial from Try React
* Update CRA link in tutorial
* Make Try React subheader a proper sentence
* Add "minimal"
* Explain local dev setup is more work than Codepen etc
* Fix typos
* Add : between headings
* add note that CRA is not lightweight
* fix typo
* Update add-react-to-a-new-app.md
* Update add-react-to-a-new-app.md
* Remove the Bower note
* Update try-react.md
* Tweak wording
* Use direct link
logo-large was a custom version of the logo made just for the banner background. It was also scaled up manually rather than taking advantage of svg's inherit scaling. This change reduces its size, makes it just a plain white version of the react logo, and moves most of the custom stuff into css. It also moves it from the static folder, over to the icons folder where it can be imported as a url.