work on logo and favicon as well as the fixes below

resolves merge conflict

makes logo and strapline same size, adds link back to home from features, lightens background on new bill image

adds ubuntu font family and removes unused font files

fixes navbar logo alignment

adds vat section to homepage and features page

fixes issue with sidebar links being unclickable at mobile size

adds autofocus to email field on modal sign in

changes resizing of forms

prevents wrap on amount and vat cols

adds no wrap to vat headers and wraps vat rate col at 10% width

aligns vat header right on invoice show

adds the missing button row for the VAT section on homepage