* Rename the "killperson" command to "removeperson"
"killperson" is unnecessarily hostile so change the command name to
"removeperson".
Fixes#684.
* Re-generate man pages
* Update contribution guide
There's no longer any pre-commit hooks so don't mention them.
* Add alias from `killperson` pointing at `removeperson`
* Update git_secret_removeperson.sh
Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
