- Removed all jQuery AJAX calls and replaced with our fetch wrapper
- Tested the markdown editor preview button functionality and it works
as before
# Demo using `fetch` instead of jQuery AJAX

Signed-off-by: Yarden Shoham <git@yardenshoham.com>
(cherry picked from commit 1f6de13897fa0ac74087b2d1ec00cbef06caf2f7)