Bug 28386: Adjust .mailmap

Bug 28386: Adjust .mailmap

Again, we need to adjust our .mailmap
This time the goal is the use it in place of the dev_map.yaml we have in
the release tools.

This will be generated for the release notes, history.txt and
contributors.yaml file

This can be tested using:
  git check-mailmap "author <email>"

For instance:
  git check-mailmap "Wrong name <jonathan.druart@bugs.koha-community.org>"

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>