Update Person Schema
Update Person Schema

This update is part of the work the Organisation Pages Team is doing.

Uppon some research, we have noticed inconsistencies on how editors have
been using the different fields (title, forename, surname and letters),
some records had the title in the forename and others had the title,
surname and letters into the surname.

To avoid future inconsistencies we have decided to have one field
(full_name), this way we also are addressing the [Service
Manual](https://www.gov.uk/service-manual/design/names#use-a-single-name-field-where-possible)

Trello: https://trello.com/c/32LO2xT8

alphagov/govuk-content-schemas,alphagov/govuk-content-schemas