stub help modal; cleanup

src/model.rs

@@ -20,17 +20,10 @@ pub struct Taggart {
 
 #[derive(Debug)]
 pub enum Mode {
-    Help,
-    Edit {
-        value: Arc<str>,
-        index: usize,
-    },
-    Save {
-        value: u8,
-    },
-    Quit {
-        value: u8,
-    },
+    Help { page: u8 },
+    Edit { value: Arc<str>, index: usize, },
+    Save { choice: u8, },
+    Quit { choice: u8, },
 }
 
 impl Taggart {