Show version number in site navbar

[ridly]

Hello guys,

this is just a recommendation.
It would be good to show the actual version number in the navigation bar when opening the guide:
https://svelte.technology/guide

The user has no idea if the guide is related to V2 or V3 or ....

As an additional bonus, if the version is a dropdown and the user can switch which version he is looking at, then you are awesome.

Cheers
Tamas