feat: create new header component

This component is now required for forms.

src/components/mod.rs

@@ -10,9 +10,10 @@ mod utils;
 mod validated_form;
 mod lists;
 mod toasts;
+mod header;
 
 pub use self::{
     action_button::*, banner::*, dashboard_button::*, lists::*,
     loading::*, multi_entry::*, panel::*, row::*, text_field::*,
-    validated_form::*, toasts::*
+    validated_form::*, toasts::*, header::*
 };