Updates to Quick Start Page and New Template for subpages

This PR:

- Creates a new Bootstrap Template with side navigation for sub-pages (Quick Start, Tutorials, etc.)
- Added more instructions to the Quick Start Page

My Next Steps will be to:

- Create a Tutorials Landing page
- continue adding content sub-pages

It'd be nice to try to

1. manually scrape older OL documentation that's still relevant and 
2. categorize all text on all current HTML pages into JSON files,
3. then use Handlebars.js to populate the HTML from JSON. 

The JSON can then be translated to a DB or whatever other docs system you guys decide to use later on.

If this is an ok direction to start on please let me know, otherwise I'll keep working on templates.