feat(docs): move Theme-toggle to Navbar

[juliusmarminge]

Is your feature request related to a problem? Please describe.

The theme toggle is currently in the right sidebar when browsing docs, maybe we should move it to the navbar to be more standardized?

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[nexxeln]

I kinda like it there its different.

[c-ehrlich]

navbar would be better imo

[gabrielelpidio]

I made a PR that includes the change to check how it looks

[benmarg]

navbar would be better imo

I think after seeing it in @gabrielelpidio PR, I'm of the mind it looks better in the Nav bar as well.

[juliusmarminge]

it's in the navbar now, we can move it back if we don't like it. what do you think @nexxeln