Update "nf-core list" after using "nf-core download"

[lconde-ucl]

Description of feature

Question from slack:

Is there a way to use nf-core download and have the output of nf-core list updated with the pipelines that were downloaded? It seems that nf-core list only picks the pipelines downloaded via nextflow pull. Is that right?

PS: just moving the "workflow" folder to ~/.nextflow/assets/ does not work as a quick solution, it gives the error "This git repository looks broken. It's probably a good idea to delete this local copy and pull again"

Thanks