add state model figures to documentation

[vivek-bala]

I don't think the state model figure is available in the documentation. Right now either need to look for the document on Gdrive or print the states using RA method. Might be handy to have the pilot and unit state model in the documentation.

[andre-merzky]

Well, that should go into the RP docs, really - but we may want to reference those docs from RA.