This is a style and UX tidying commit

* Improve Home styling
* Improve /runs styling
* Remove /trends and /concordance code
* Remove plaintext.py, place that information in Home
Home -> About page, / -> Runs
Indent 4 -> 2 in HTML and CSS files
Merge pull request #336 from hammerlab/tidy-up-UX-for-release

This is a style and UX tidying commit