This is a placeholder ticket for a few related things already discussed on IRC.

• [ ] create a reference maildir with a couple of emails, we may possible want to throw in a reference notmuch as well, best place might be the stylesets folder
• [ ] recreate existing sytleset screenshots with the reference maildir; this might involve having reference settings as well, but we can start small
• [ ] create a "show off"/template styleset with ridiculous, but easy to distinguish colors to cram as much of the possible configurations into it as possible
• [ ] go through existing stylesheets and update them if they are missing new features

Note, that once we have this, any updates to styles must touch on at least the template styleset.