It helps to have less verbose README.md

These pages should get credited to Source Code. (I should also
check about CODEOWNERS entries too.)

Shouldn't start with a leading slash.

Describe what Gitlab Shell is capable of

Changelog: added

Now `master` is removed, this is no longer needed

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Over a year ago, through e0824f17, the
hooks in this repository were updated to not be successful, basically
block each push from happening.

This change removes the hooks, and updates the documentation. There's no
customer impact, and these changes are just part of a general cleanup.

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Include information about not requiring a second maintainer review
when releasing.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>