Update Plotting Documentation

[hdavid16]

The documentation says NetworkViz is tightly integrated with LightGraphs, but NetworkViz is no longer in the Julia registry. Can you remove this from the docs?

It would also be good to add a reference to https://github.com/JuliaPlots/GraphRecipes.jl

[agucova]

Sadly, this is also the case for GraphLayout (archived, succeeded by GraphPlot), which is the first library that appears in the docs. This only leaves GraphPlot.jl (without support for weighted graphs and apparently inactive) and SGtSNEpi.jl.

[hdavid16]

Another package that is not listed is GraphMakie.jl

[matbesancon]

PR very welcome to add these :)

[hdavid16]

Will do