Better Skeleton & Loading

[rushi]

• Better design. See: Tailwind Play Not using this, makes it too busy. Our original one is better
• Make it easier and more flexible to plugin.
• Types:
  • Grid of Skeletons
  • Image skeleton https://flowbite.com/docs/components/skeleton/#image-placeholder
  • Multi-row skeleton https://flowbite.com/docs/components/skeleton/#default-skeleton
  • Graph placeholder - Possible in X2 seller? https://flowbite.com/docs/components/skeleton/#widget-placeholder
  • List https://flowbite.com/docs/components/skeleton/#list-placeholder
• Ensure placeholder text is shown
• Add <Loader /> component from X2 Seller