[BUGFIX] - Fixing infinite loop of code block within table cell.

When a code block was within a table cell such as from a confluence import, the normalizer would go into an infinite loop trying to remove everything and then the card would never load. This adds a fix for this issue to essentially remove any parts of the code block inside the table cell before it starts looping infinitely.

[BUGFIX] - Fixing some issues with removing paragraphs again

fixing backspacing and schema issues

Reverting tables from having blocks inside them

Making it that table cells only have inlines and text inside of them. We will revisit blocks at a later time.

[update] Slate updates and fixes

This release adds an update to slate 0.34.x as well as some small bugfixes.