bitcoinarmory: remove

The project has been abandoned upstream for 2 years. For its entire
lifetime in nixpkgs, the installed binaries segfault due to static
library linking that couldn't be undone due to proprietary changes
to said libraries. In addition, there are unpatched CVEs according
to #29956.

Fixes #29956.

Signed-off-by: David Anderson <dave@natulte.net>