Rename title of main page

Move accent from negative side of current monetary system.
Usury is loud word, it can frighten, we already overuse it.
Changed text on main page

Added excurse in history.
Flatten narrative to be clear for human who first time opens a site.
Avoided specific economic and computer words, and non-wikipedia links.
On this page we already have words 'usury', 'Bitcoin' and 'demurrage'.
We doing it for normal people, so text should be as simple as possible.
Added images for main page
Modified css to support future changes on main page
Added instructions for easy start on main page
Rename 'How it works?' -> 'Economy'
Rename 'Basics' -> 'Technology'
Rename 'Why use?' -> 'Advantages'
Rename 'About' -> 'Story'
Reorder menu. Move 'Resources' after 'Advantages'
Removed note about beta testing on 'Download' page

Release was more than month ago, testers had enough time to migrate