WorkflowHub documentation comments [WIP]

[hmenager]

The following points are based on going through the wiki:

• there is no homepage for the user guide (or none I could find), you either access a project page (https://github.com/workflowhub-eu/about/wiki) or a guide on uploading workflows (https://github.com/workflowhub-eu/about/wiki)

• a bit of introduction on the homepage would be interesting, and another one in the "workflow upload"

• the difference between uploading and referencing workflows should be explained

• the workflow type should be explained

• for "uploading galaxy workflows", I would guess that specifying how to retrieve the ".ga" file would be useful information to some users.