Signposting RegenCHOICE

There are four reasonable starting points for RegenCHOICE, all of which cross-refer:

• the RegenCHOICE idea explains the basic idea
• the RegenCHOICE index is a top-level index to materials here
• the RegenCHOICE topic is there to handle references to the term
• the namespace ch for RegenCHOICE goes into the wiki structure