New project welcome page does not propose the possibility to run git config for local project

The welcome page for a new empty project (without README) give commands to configure one's identity using git config. However these instructions are only provided using the --global flag, potentially replacing the user's configured identities for other projects on the same machine.

A proposition for a fix would be to add a dropdown allowing users to switch the view between global and local options, alongside an explanation text stating the difference, and potentially a link to the git config doc.

CC @stingrayza