chore: move some components to custom ui crate (#10)

Reviewed-on: https://git.reya.su/reya/signed/pulls/10

crates/workspace/src/lib.rs

@@ -1,16 +1,13 @@
-mod pixel_avatar;
 mod views;
 mod workspace;
 
-pub mod image_cache;
-
 use gpui::{App, AppContext, Entity, Window};
 use gpui_component::Root;
+pub use signed_ui::image_cache;
 pub use views::{RepoListView, SidebarPanel};
 pub use workspace::Workspace;
 
-/// Build the root view tree. Requires `signed_state::init` and
-/// `gpui_component::init` to have been called first.
+/// Build the root view tree.
 pub fn root(window: &mut Window, cx: &mut App) -> Entity<Root> {
     let view = cx.new(|cx| Workspace::new(window, cx));
     cx.new(|cx| Root::new(view, window, cx))