Support RTL in the Preview pane

[tareefdev]

Writing RTL text in the markdown editor works well. The text appears from right to left:

However, when pressing on the Preview button, the text rendered without direction: rtl property and appears from left to right:

This is different from #1769 issue where the layout of the CMS itself was requested to support RTL.

Also, I would be happy to solve this issue if there is some info about where/how that work should be done.

netlify-cms-app 2.9.1 netlify-cms-core 2.11.0