Remove parsing of data which is not used within `auc`. Later iterations
may use these but they can be gradually added whenever needed.

Also remove HTTP code handling of error codes no longer used by the
backend. Early iterations of the server where infinitely complex to
figure out created images and announce them to clients but ever since
everything is stored in JSON, things got better (aka simpler).

If a package is missing on the upstream server, color it in red.

Signed-off-by: Paul Spooren <mail@aparcar.org>