overwrote _index.jade to index.jade

completing the rewriting process for the index view
summary of previous commits:

* created separate stylesheet for index.jade
* rewrote index.jade in jade-only (better readability and consistency)
* ammended the flow of whole view i.e.
    - made carousel screen wide
    - made sats area and how-it-works use native BS and Flat-UI classes as much as possible
    - repaired alignment issues etc.