people.xml: Swap Jane for Purvi
people.xml: Swap Jo with Fred
people.xml: Swap Anne for Florence
people.xml: Swap Rich for Tilahun
people.xml: Swap Iddo for old Iain
people.xml: Swap new Iain for Mohammed
people.xml: Swap Amos for old Iddo
Clean up old images and add Susan's picture

Accidentally added Susan earlier so her picture was missing.