Improve navigation and learnability of Flamingo menu

There 2 major problems with the Flamingo menu:

A. Navigation downgrade

• In Colibri the menus played 2 roles: dropdowns and links. You could easily access the submenu for the space, while also clicking and navigating to that particular space.
• In Flamingo this is not possible since the menus are activated on 'click' and not 'hover'. This is better from a mobile accessibility perspective, but could put problems on users accustomed to the old way of working.
• In Flamingo it is still possible to navigate if using the mouse's middle click, but this functionality has discoverability issues.

B. Learnability

• For normal users, seeing that Main is marked as a SPACE, and WebHome as a PAGE, increased learnability of the wiki concepts.
• In Flamingo these markers are not available anymore.
• There is XWIKI-9440 . While I agree in theory with it since Page is more common as an action than Wiki, removing also the hierarchy could increase learnability curse.

A solution would be to add the 'Wiki/Space/Page' markers and maybe divide the navigation and menus between markers - name.