revised Vaults of Vyzor campign intro

Yesterday I got a query on how to join the Vaults of Vyzor campaign.  The answer to that and several other questions can be found in this document:

https://docs.google.com/document/d/1-oI100bKb7I5m4Qh4ZoRIDxIE8PW5rlkKz-DzPvXXjk/edit?usp=sharing