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Checking if the terminal supports 256 colors is better suited for
our purpose. Checking if `$DISPLAY` is set doesn't tell us if our
colors will be displayed correctly.

Used color encodings from
https://metacpan.org/source/WOLDRICH/Term-ExtendedColor-0.224/lib/Term/ExtendedColor.pm

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

in the trapd00r theme vcs info is already displayed on the first line if in a version controlled directory. the second vcs info was displayed at the end of the second line without providing additional information. this was removed.