community/nikto: move from main

This was moved to main/ in 2014 through 8530c974 but probably belong to community/.

There's also a 2.5.0 release, the first in over eight years, that may require some rework of the APKBUILD.

https://github.com/sullo/nikto/releases/tag/2.5.0

https://www.cirt.net/Nikto2