Improved order edit appearance

Improvements ✨

• Improve the look of the action buttons in the order edit view.
• Improve the look of the products/shipping/fees/totals in the order edit view.
• The “what’s new” notice can be permanently hidden for all future versions of Dashify.

Bug fixes 🐞

• PHP warning about a null query parameter on the “add new order” page related to the order pagination buttons which don’t appear on this page.
• “What’s new” notice possibly not dismissing.