Update to interventions docs on wikimo

[Mike Taylor]

Hi all,

Just writing to share I've done the following:

1. "Archived" the draft Interventions Release Process google doc[1] (via
a fool-proof "Status: Archived" comment).
2. Updated https://wiki.mozilla.org/Compatibility/Interventions_Releases
from the google doc with our latest process.
3. Added a pointer to the new doc from
https://wiki.mozilla.org/Compatibility/Go_Faster_Addon/Override_Policies_and_Workflows#Preamble

There's a few TODOs in the new wiki page, but it's safe to forever close
that Google doc as a source of truth.

[1]
<https://docs.google.com/document/d/1hyIv14aKDzGixuPz3rFHmVSXs-DlTFfJoleQxILwGws/edit#>

later,

--
Mike Taylor
Web Compat, Mozilla