Update the admin controller panel
- Deleting product from admin product list will refresh the list and display a notification
- Admin urls have been updating
  - /admin/modifyproduct -> /admin/product/edit
  - /admin/modifyproduct -> /admin/product/edit/1
  - /admin/addproduct -> /admin/product/add
- The same controllers have also need renamed respectively
- Add ability to change the website branding - title and slogan (which now appears on the footer)
- Add skeleton for modifying product categories - the controller still needs to be written