Add Devkit V2 building guide to the website

[GRbit]

Is your feature request related to a problem? Please describe.
I wanted to build Devkit V2 for myself, but realize that the guide only describes how to build v1.

Describe the solution you'd like
I'd like to see one more guide on how to build Devkit V2 on the https://docs.omi.me website

Describe alternatives you've considered
Alternatively, we can just add a link to https://github.com/BasedHardware/omi/tree/main/Friend/hardware/triangle%20v2%20w%20memory to the https://docs.omi.me/docs/hardware/DevKit2 page.

Additional context
Since the project is very user friendly, I expected to see a V2 build guide somewhere in the docs, and spent quite a bit of time googling until I found it in the github repository (and feeling silly). I think adding at least a link to the github will save time for potential users and developers, which may attract more of them to contribute.

UPD: If adding the link solution will be considered ok, I can create a PR myself.