events via email guide plus cleanup

add events via email guide
cleanup markdown for index plus faq
Merge pull request #241 from DataDog/add-events-via-email

events via email guide plus cleanup
Fix API button wrapping.

Fixes #240.
Merge pull request #242 from DataDog/conor/fix-api-wrapping

Fix API button wrapping.
Merge remote-tracking branch 'upstream/master' into ja-jp