feat: Add operators to navbar & merge dropdown implementations

[MoritzWeber0]

Resolves #292

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[lenderom]

Could you check the mobile navigation? I think it looks a bit bugged. Maybe we don't need the border in the mobile navigation. :)

But the Desktop Version is amazing 🤩

[MoritzWeber0]

Could you check the mobile navigation? I think it looks a bit bugged. Maybe we don't need the border in the mobile navigation. :)

But the Desktop Version is amazing 🤩

I'm not 100% happy with the mobile navigation either, but without borders is also not optimal (It's hard to recognize where the options belong to without the border). Maybe we can try a few options and have a look at it together.

[MoritzWeber0]

Option 1	Option 2	Option 3

[therobrob]

i've identifies just two little aspects:

• When the mobile menu is open, only the elements within the menu should be focusable. We implemented this on deutschebahn.com, but unfortunately I can't remember exactly how we did it. :'D
• ESC-Support for mobile menu

We can outsource it into a new issue, if you like :)