Update tutorial text and add examples directories to gh-pages

This is a significant update to the text of the tutorial.  In addition, an examples directory, with sub-directories, has been added to help the user get started with Radar.

/cc @zendesk/zendesk-radar

### Steps to merge
 - [ ] :+1: of the team

### References
 - Jira link: none

### Risks
 - None: no changes made to the radar codebase; just an addition of examples code