Webpage update: Documentation [Tutorial]

[martinscooper]

The tutorial section of the documentation should be adapted after the addition of the multiclass mode.

• Do we want different tutorial for the different modes?
  • Diverge the tutorial from the the where a workspace has been created
• Some sections should be added that are not yet present:
  • label quality (suspicious and contradicting labels)
  • model evaluation
• Add an explanation about the workspaces mode. Either there or in a separate section