Docs links should cover end-to-end marketplace publishing requirements

[kingdonb]

https://code.visualstudio.com/api/working-with-extensions/publishing-extension#get-a-personal-access-token
CI releases are blocked if this token expires, until it is replaced (the replacement token is created here):

https://dev.azure.com/weaveworks/_usersSettings/tokens

I have got this on my personal calendar as a reminder every 60 days, the token is configured to expire so a manual rotation is required. This should be the only dependency between our extension and the VSCode marketplace, except for maybe one more for the telemetry data. (We have not figured out how to attach telemetry data to a metrics explorer yet, and it appears as if we are not actually collecting metrics even though there is some code to support metrics collecting, I'm not 100% sure about this though.)

This information should probably be added to DEVELOPMENT.md for continuity planning etc.