Allow organisation to remove themselves from a project

[matmaxgeds]

'save' should still work, but after that they should be returned to the initial data entry screen as they no longer have permission to be editing that project

Need to think how it relates to the requirement that an organisation adds themselves as either the funder or implementer of a project before saving - which is still a good rule.

This suggest needing something about the timing e.g. if this is more than a day after the initial entry for a project, organisations can remove themselves?