refactor(editor): ♻️ Undo / Redo buttons + structure refacto

Yet another huge refacto... While implementing undo and redo features I understood that I updated the stored typebot too many times (i.e. on each key input) so I had to rethink it entirely. I also moved around some files.

apps/builder/libs/kbar.ts

@@ -1,16 +1 @@
-export const actions = [
-  {
-    id: 'blog',
-    name: 'Blog',
-    shortcut: ['b'],
-    keywords: 'writing words',
-    perform: () => (window.location.pathname = 'blog'),
-  },
-  {
-    id: 'contact',
-    name: 'Contact',
-    shortcut: ['c'],
-    keywords: 'email',
-    perform: () => (window.location.pathname = 'contact'),
-  },
-]
+export const actions = []