Right now table toolbar has fixed positioning, and in some cases it brings inconvenience.

Steps to reproduce:
1. Open any content with RichtText field for editing
2. Insert a big table (50 rows) into RichText field
3. Scroll to the last table row and try to insert a new row after it

Expected result
The table toolbar should be shown on the screen, and new row should be inserted without any scrolling.

Actual result
The table toolbar remains at the start of the table. And the editor needs to scroll to it, to add a new row.