Fix API button wrapping.

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

Fix API button wrapping.
Add a new "Guide To Monitor" with walkthroughs of the new editor.
Updates from review of monitoring guide.
Updates to create monitor docs based on feedback.
Convert monitor guide to markdown.
More updates of monitoring guide.

- Add info about API to FAQ.
- Add info about notifying users outside of datadog.