Keep only zot.meta.xml for schemaSpy report generation
Created by: HaakonME
Keep only zot.meta.xml in doc/schemaSpy_hubzilla for schemaSpy report generation, and delete the example report.
Someone other than me have put the example report in the hubzilla_er directory. This should also be deleted.
It would be helpful to create different versions of zot.meta.xml covering different relationships, e.g. zot_xchan.meta.xml and zot_uid_and_guid.meta.xml , as the number of relationships in the report might otherwise be too many at once.