Improve documentation about running parallel push/sync with Git

[Ben8t]

Feature description

related to #81
Git cannot guarantee the order in which the pushes will be received by the remote repository. If two users push changes at the same time, Git might reject one the push or show the warning shared by Will in issue description above.
It's not recommended to run such pattern due to the potential for conflicts and data loss. Preferring Sequential workflows or pushing to separated branches.

👉 Add mention to this in the documentation of the corresponding tasks (git push, and sync ones)