Since Rofi 1.7.1 (specifically davatorium/rofi@0e70d8a), the deprecated
`theme` option in the `configuration` section no longer works. For 1.7.0
and up, `@theme "name"` is supposed to be used *after* the
`configuration` block.
If this commit now it is possible to define a custom theme directly
using Nix, like this:
```nix
{
programs.rofi.theme = {
"*" = {
background-color = "#000000";
border-color = "FFFFFF";
width = 512;
};
listview = {
cycle = true;
};
};
}
```
And this will be converted to the proper rasi format to be used in
rofi.
