Add CertifyLegal to demos

[funnelfiasco]

Probably in known-and-unknown.md

[funnelfiasco]

This needs to happen after the next release, which will include the ClearlyDefined certifier in the demo compose file.

[robert-cronin]

I'd like to take this one on if no one else has started already, however I think there is a dependency here that's worth noting:

The guacone query known command is the main way the known-and-unknown.md demo explores different GUAC nodes, but it doesn't yet include CertifyLegal nodes to the best of my knowledge.

To properly document CertifyLegal in the docs, I've submitted a PR here that adds CertifyLegal support to the query known command first.

[funnelfiasco]

Good catch! We should consider whether or not we want a demo of legal to be part of the broader known-and-unknown demo or if we want it standalone. Anecdotally, the legal info seems to be a major feature for some users. On the other hand, we don't have a lot to show at the moment (I'm thinking about what a query legal command might do before I open that feature request), so it's probably fine to put it in there for now.

One thing I want to undertake in the near future is reworking some of the demos to put the vuln-related stuff first (since that seems to have the best retention from our Google Analytics stats), so depending on which of us gets done first, there might be some edits to make anyway. :-)