[Forums] Simplify Forum posts UI and code

George Katsikasrequested to merge
dev_GK_20231004_beautify_forums into master

This MR changes the style of forum posts to allow for collapse of nested posts, and make them stand out more.

Screenshots

Motions

SCR-20231004-mqcs-2

Nested posts

SCR-20231004-msno

Edited by George Katsikas

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