New homepage + vanilla example.

This change does the following:
1) moves the content from the "home" page to /overview/ , since the home page is supposed to simply display an example plus "get started"
2) adds code for the client-side rendering of the json formatted strings - via intl-messageformat -- this is the "plain vanilla" example

What's needed

- [ ]  @clarle 's Yepnope changes to call into the init function directly, instead of including a script tag in the example partial.