[fprint] Migrated to gitlab.freedesktop.org

[Bastien Nocera]

Hey,

libfprint and fprintd have both migrated to gitlab.freedesktop.org:
https://gitlab.freedesktop.org/groups/libfprint

This means that driver authors should be able to fork the repository in
their personal area to work on a driver, and file MRs once the driver
is ready for review, which should hopefully reduce the amount the
friction of contributing patches to those 2 projects.

I'll be adding continuous integration tests shortly, as well as trying
to put up-to-date documentation online there, to replace the old
website.

Cheers