Enhance description of Versa processing, particularly pipelines, with process/data flow visuals

[uogbuji]

Graphs would be inserted into the READMEs & into docs. Unfortunately GitHub support for this is still an open request. Supported on GitLab just fine.

Looking into Mermaid at first, though it seems a bit limited for DFD type uses.

Fallback is plain old Google Draw.

[uogbuji]

Playing around with Mermaid I could get as far as the likes of the following, but it's provinf unsatisfactory.

graph LR;
    subgraph Versa pipeline engine
      FP["Fingerprinting"] --> TP1["Transform Phase 1"];
      TP1 --> TP2["Transform Phase 2"]
      FP & TP1 & TP2 --- IM & OM
      IM[(Input model)]
      OM[(Output model)]
    end

Can be viewed on their live editor