Rename timbre to editor, remove outdated tabs

src/App.js

@@ -1,12 +1,12 @@
 import React from 'react';
 import Menu from './features/menu';
-import TimbreSwitcher from './features/timbre/timbreSwitcher';
+import Editor from './features/editor';
 
 function App() {
   return (
     <div className='grid grid-cols-6 grid-rows-1 gap-4 h-screen'>
       <Menu className='col-span-1' />
-      <TimbreSwitcher className='col-span-5' />
+      <Editor className='col-span-5' />
     </div>
   );
 }