To remove your yaru-git shell, first go to Tweaks and select whatever shell and themes you will be switching to as your alternative, then run the last command from the install but choosing uninstall instead of install … like this
sudo ninja -C build uninstall
logout, and log back in selecting the default shell you were previously using (for me it’s just the default Gnome). You should be back to the ‘normal’ world.
BTW - Shameless sefl-promotion … check out the Espresso extension 