Main menu enhancements

[crumbking]

While playing around on different screens and browsers I find it quite confusing how we show the menu. Topics/issues: logged in menu

• [x] three logout links
• [ ] three dropdowns/toggles
• [ ] some screens show username/ numbers some screens don't show it
• [x] hamburger combined with caret looks strange, never seen this before
• [x] hambuger not visible on mobile phones (firefox) - seems some unicode translation issue
• [ ] lg screen: many double/triple menu items
• [ ] black dropdowns different styles (font, aligments, ...)

logged out menu

• [ ] signup button in menu and on startpage
• [ ] three menu versions (startpage, login-page, other pages)
• [ ] hamburger without caret (my preference)

Maybe we should tackle these in separate issues ....