move howto/git to howto/gitolite authored by zen's avatar zen
As a preparation to add documentation for commit signature verification,
let's move the old Gitolite documentation to howto/gitolite so we can
add howto/git with new doc.

refs #42099
[Continuous Integration](https://en.wikipedia.org/wiki/Continuous_integration) is the system that allows tests to be ran
and packages to be built, automatically, when new code is pushed to
the version control system (currently [git](howto/git)).
the version control system (currently [git](howto/gitolite)).
Note that the CI system is implemented with [GitLab](howto/gitlab),
which has its own documentation. This page, however, documents the
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