Improve and consolidate navigation

[eriknson]

The current nav setup displays different left-side navigations depending on if you're on the Wallet or Snaps tab by the top. I think this differentiation and having the navigation change depending on what part of our offering you're looking into can be confusing.

I suggest we integrate our nav into one overviewing all of our products, see attached draft.

Current design for comparison

[alexandratran]

Regarding the wordmark, we'd need a version of it compatible with dark mode. Do you know if one exists? Also, do you know who to ask for a documentation-specific wordmark (for example, like the user support one)?

[eriknson]

Here's the vectorized wordmark. For dark mode it's the same but with white text instead of black (which I think is best to switch via code using the SVG).

Re: Documentation-specific wordmark, I think best practice would be to just add | Documentation in the DOM behind it instead of a custom SVG image including the text. This way it'll also adapt to light / dark mode like everything else.