Enable local install, mirroring approach in icons repo.

[jaccarmac]

No description provided.

[SmartFinn]

Kvantum themes should be installed to $HOME/.config/Kvantum. That is why I didn't add an option for the local install. Maybe adding make local-install task will be enough?

[jaccarmac]

Ah, didn't realize that. That or another environment variable for Kvantum themes I suppose. Thanks for pointing it out, I don't use Kvantum :)

[jaccarmac]

I had also missed the Makefile at first, that seems like a nice way to do things. My Make is really bad, so I need to figure out variable-setting and the way to set up the dependencies to run in the correct order though. The _sudo stuff added is still necessary though I believe? So I'll be adding to the PR as opposed to redoing it.

[SmartFinn]

The _sudo stuff added is still necessary though I believe?

I don't see a case when it can be useful.

My Make is really bad

The task is not so easy. I try to do it a bit later.