Add a description field to Person

Allow Persons to have a field describing themselves, like a short bio.

changed milestone to %2.0a2

added part::backend type::feature workflow::discussing labels

created merge request !211 (merged) to address this issue

mentioned in merge request !211 (merged)

added workflow::confirmed label and removed workflow::discussing label

closed via merge request !211 (merged)

mentioned in commit 6ffcf67c