Hide people feature available for PhotoPrism sponsors (Patreon)

PhotoPrism sponsors can now hide people. 

See https://docs.photoprism.org/user-guide/organize/people/#hiding-people

To enable early-access features:

• add PHOTOPRISM_SPONSOR: "true" to your docker-compose.yml file
•  or use the command line flag --sponsor

Thank you very much for sponsoring PhotoPrism!

Michael & Theresa