ui: introduce profile picture widget

We are starting to use profile pics in different places, let's make it a
widget. We'll also probably need to have adjustable sizes and such soon.

Signed-off-by: William Casarin <jb55@jb55.com>

src/ui/mod.rs

@@ -6,7 +6,7 @@ pub mod username;
 
 pub use note::Note;
 pub use preview::{Preview, PreviewApp};
-pub use profile::ProfilePreview;
+pub use profile::{ProfilePic, ProfilePreview};
 pub use relay::RelayView;
 pub use username::Username;