Trello #449 Discourse tweaks - update restricted topic/category icon, header hamburger menu cats into 2 cols, fix active dropdown header menu icon colors, add spacing next to unread message notif badge in header user menu
Trello #449 Discourse tweaks - topic page - fix line alignment in topic-map (easier done by forking the template and going back to old layout with H4s on top rather than updating the CSS)

- and since we forked the template, let's also switch the Views, Likes and Users headings to icons, like on the topic list page
Trello #449 Discourse tweaks - add the FAQ link to navigation
Merge branch 'feature/Boris-tweaks1407': Trello #449 tweak styles and add FAQ link to navs