Default config file location customization

[Issafalcon]

Is your feature request related to a problem? Please describe.

Using Neovim on Windows, when running :LazyGitConfig, the path that it looks for the config file is incorrect (it should be ~/AppData/Roaming/lazygit, assuming that the ~ translates to the USERPROFILE variable)

Describe the solution you'd like

Firstly, the default path on windows could be corrected to look in the right place for a Windows install of lazygit, but a more robust solution would be to provide a configurable setting for the path variable (forgive me if I missed something and this is already possible, but I couldn't tell from the README)

Additional context

If this is already configurable, that's great!

[kdheepak]

I don’t have a windows machine to test this. Would you be able to submit a PR?

[kdheepak]

Thanks for opening an issue btw!

[Issafalcon]

No worries. Sure, I'll stick it on the todo list :)