Update notifications to make dismissal more intuitive #1525

Describe the bug
While editing a draft, the dialogue stays over the "Save Page" button and does not go away

Expected behavior
The dialogue should go away or stay in a place which lets the "Save Page" be visible.

Screenshots

Your Configuration:

• BookStack Version: 0.26.2
• PHP Version: ?
• Hosting Method (Nginx/Apache/Docker): Docker