default instalation path

[kenardes]

in the Makefile, the default installation path is /usr/local, this path need root permission, it will trigger error if not change to path with user permission because cargo can not run as root in default configuration. I believe ~/.local is better.

[daa84]

Don't think change default is good idea. Not sure anybody use default path, but this can break install script.
Also /usr/local is default for most libraries and programs i see.

[kirillrdy]

Maybe its worth noting that people can just cargo install to get nvim-gtk installed in cargo bin dir which is usually in path therefore its not really an issue