If you're like me, and the way you get to Git is windows key + G + I + Enter, then you can simply hit the windows key, search for Git, right click on the resulting Git Bash
icon, select properties, and change the Start in:
field.
I'm not exactly sure what this does, because I'm not exactly sure what Git on Windows is (a facade on top of sh which itself is a facade on cmd?), but in any case, you can now pin the shortcut that Windows pulls up on a search for "Git" to your taskbar, or to your desktop, and it will still start in whatever directory you set it to.