ui2: Do not enable 'stories' feature by default.

This cuts down LLVM IR size from 3 million lines to 700k in debug build.
This then leads to ~3s compile time in debug build (without incremental on ui itself), as opposed to 10.5s on main.

crates/ui2/src/components/keybinding.rs

@@ -80,18 +80,12 @@ pub use stories::*;
 #[cfg(feature = "stories")]
 mod stories {
     use super::*;
-    use crate::Story;
-    use gpui::{actions, Div, Render};
+    pub use crate::KeyBinding;
+    use crate::{binding, Story};
+    use gpui::{Div, Render};
     use itertools::Itertools;
-
     pub struct KeybindingStory;
 
-    actions!(NoAction);
-
-    pub fn binding(key: &str) -> gpui::KeyBinding {
-        gpui::KeyBinding::new(key, NoAction {}, None)
-    }
-
     impl Render for KeybindingStory {
         type Element = Div<Self>;