Linking pggb output to Panache input

[SingingMeerkat]

Interest have been expressed about visualizing graphs from pggb into Panache ( cf nf-core/pangenome#197), but the steps to convert formats are currently unclear.

Some documentation highlighting how to convert pggb's output into Panache's input would be welcome.

I cannot dedicate much time to it right now, but maybe that's something that @francoissabot can look into? I at least create the issue to look into it later.

[francoissabot]

We have a prototype for GFA parser in a PAV matrix, will see if we can adapt it. Normally it will work for PGGB as well as for Mningraph/Cactus and GFA1.1 formats