Added howto static page with video nasties and associated key points.

[ntoll]

This branch introduces the following features:

• A new static page called "howto".
• A new menu option on all pages that links to the howto page.
• Content for the new howto page (video / screencasts and associated key points).

You can preview what this branch looks like on a test instance here: http://54.229.47.155/howto