Finish up the dashboard page

- use the grid system for hero text, but reflow the text on small
screens
- transition navigation/recent jar colors
- disallow blank searches
- pad the recent jars link so you can click the whole box
- fix up the padding and text-sizes a bit (these are still probably off)
- fix up the colors a lit (these are probably still off)
- use the grid on more screen types (to not immediately snap to one
column when the screen gets smaller)
- remove the search button for smaller screens
- vertically center the navigation and add a background color on hover