This is where modules will define how you're going to interact with the computer whether you should use something ranging from a full-fledged desktop environment with bells and whistles to a minimalist desktop environment only composing of a window manager, a terminal, and a bar.
The following list is the summary which can also serve as a guideline to developing a theme.
* Due to the bigger scope and importance of this module, there is a limit where you can only enable one theme at a time.
You can disable this with `config.modules.themes.disableLimit` set to `true`.
* Custom themes should be defined in `config.modules.themes.themes` attribute (e.g., `options.modules.themes.themes.a-happy-gnome`, `options.modules.themes.themes.simple-way`).
This makes up for a namespace entirely dedicated for setting themes.
