No Grey Background colour under issue/merge request/milestone/... description section

We need to make it white instead

/cc @jschatz1 @dzaporozhets @JobV @skyruler

mentioned in issue #4122 (closed)

related to #6061 (closed)

@dzaporozhets This is fixed in !2410 (merged)

@jschatz1 my mr was about layout. This one is about issue description. Basically part of big issue redesign I told you few days ago (with nice sidebar)

This is preparation for #3981 (closed)

Reassigned to @dzaporozhets

mentioned in merge request !2573 (merged)

Status changed to closed by commit 0ee2d50e

mentioned in commit 0ee2d50e