(sheldon): remove commit message checking

New commit message rules are being evaluated (see https://git.ircad.fr/sight/sight-gitlab/-/issues/8).

~~We need to use the same for sheldon's commit message checking.~~

We need to remove this 'feature' from sheldon...

Edited Jun 23, 2020 by Didier WECKMANN

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information