Revert "Converting ViewPageTarget CSS files to LESS"

We don't yet have any way to test or verify anything with less. Not the less
syntax, not the less compilation, not the resulting css code quality.

Using it at this point doesn't seem worth the cost of not having any of that.

This reverts commit 17ddf031fef597795f7c32ededfe10bcaf6b41bc.

Change-Id: I7e8ab90f7a9f77f5cf6d7baeab586d4e0332042e