Issue #260 design changes to homepage

* grey text
* new logo on homepage only
* making main logo move right and down
couple of tweaks to design

aligning logo; the bars can clash with the text on the right, so can't
quite position to align with top of the text unless the background
splash is changed
#260 heading spacing tweaks
Issue #260 fixed logo alignment
Merge pull request #281 from theodi/ui-fixes

Ui fixes for homepage