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 [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 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), Note that the CI system is implemented with [GitLab](howto/gitlab),
which has its own documentation. This page, however, documents the which has its own documentation. This page, however, documents the
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