Sherlock: add target

[Steinardarri]

I assert that this feature request is relevant for Stylix

• [x] I assert that this is not a duplicate of an existing feature request.

Description

Sherlock is a versatile application/command launcher for wayland, built with rust and gtk4.

It has a Home Manager module and main.css file for styling.

[JumpIn-Git]

example themes can be found at https://github.com/Skxxtz/sherlock/tree/main/themes