Remove service descriptions from front page.

Just keep the titles.
Tune the styling of service links on front page.

A bit of extra margin and hover-effect.
Support box-sizing:border-box cross-browser.

Firefox requires -moz- prefix.
Extract text-shadow into a mixin.

Although we don't need vendor-prefixes for text-shadow, it's
still useful to abstract it away, so we can:

- disable all text-shadows for progressive-engancement testing.
- supply default arguments for the common configuration.
Add cancel button to admin editor UI.
Limit the max height of editor.
Merge remote-tracking branch 'origin/master'