Repository Page - Add contrast between table columns content

Currently there is a slight difference in the font color between columns. Increasing the contrast between the Name and Last Update/Last Columns will allow users to more easily scan information.

Original:

Screen_Shot_2016-07-07_at_1.46.08_PM

Proposed:

Screen_Shot_2016-07-07_at_1.46.47_PM

Central Issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/19610