Just two small changes on "Styling and CSS" page:
* tip regarding "classnames" has been placed in quote box to visually emphasize it
* link to "classnames" package now points to React related section on the page
A post-merge comment for the original PR for this section mentioned that not all libs actually extract static stylesheets (and docs shouldn't explain implementation details of 3rd party libs unnecessarily, as a rule)
* Don't use experimental syntax unless necessary
* Edit another page
* Update another page
* Unrelated bikeshed on virtual DOM
* Please, no *.jsx, we don't recommend it
* Update faq-structure.md
* Minor updates
* Update faq-ajax.md
* Update faq-functions.md
* Add binding explanation