feat: add support for multi-themes (#210)

* chore: update deps

* wip

* add themes

* add matrix theme

* add flexoki and spaceduck themes

* .

* simple theme change function

* .

* respect shadow and radius settings

* add rose pine themes

* toggle theme

crates/ui/src/lib.rs

@@ -45,7 +45,6 @@ mod window_border;
 /// This must be called before using any of the UI components.
 /// You can initialize the UI module at your application's entry point.
 pub fn init(cx: &mut gpui::App) {
-    theme::init(cx);
     dropdown::init(cx);
     input::init(cx);
     list::init(cx);