flake: add new build dependencies

[mardukpill]

Summary:

• Set the formatter for the flake to nixfmt-rfc-style.
• Fixed [BUG] Failed to build with Nix #74 by adding the required build dependencies.
• Added a new .desktop entry for the razer-settings GUI.

[JosuGZ]

You should probably split the refactor and the actual changes so it is easier to review.

I can see that the only changes are adding glib, pango and gtk3 to line 24, which looks good to me (although I have never used nix).

[mardukpill]

Ok. I've updated the pr.

[JosuGZ]

I see that you have also added the .desktop entry, the PR looks good to me.

I have two questions:

• Can't the .desktop file be copied from the original inside the .nix file? Otherwise it will be in two places
• The ìnstall.sh avoids copying this file if the system doesn't have this kind of entry. Do you think every distro will support this .desktop files?

[mardukpill]

I agree that it is a little weird that the .desktop file is basically in two places, but we have to do slightly different things with Nix .desktop file as the path of the binary is generated based off the hash of the derivation.

For your other question, I have only used Nix on NixOS, so I am not quite sure. If Nix was installed on a different distro and used as the package manager to install razer-laptop-control, it will build fine (I think even if .desktop file was unused).