Rename tasks

Rename add_users_to_project_teams to gitlab:import:all_users_to_all_projects

Rename gitlab:app:db_* to gitlab:backup:db:*
Rename gitlab:app:repo_* to gitlab:backup:repo:*
Rename *_dump to *_create

Update Contribution Guide

Reorganize settings

All overrides are marked as deprecated.
Default settings are at the bottom.

fix dark code preview background when displaying long lines

Added compare switch

Added compare switch

Disabled sorting commit ids

Better organization of styles