Update jet labelling docs
Our jet labelling docs are a bit confusing: https://ftag.docs.cern.ch/algorithms/labelling/jet_labels
We describe between delta R hadron labelling, and ghost parton labelling. but there is a full 2x2 matrix of possibilities
- whether to label hadrons or partons (in FTAG we generally use hadrons not partons)
- whether to associated hadrons or partons to jets using deltaR cones or ghost association (in FTAG we want to switch from dR to GA)
We should also mention the additional labels for pT, dR, pdgid, etc that we have for the hadron labelling scheme