Add MOBIE to javadoc.scijava.org

From fiji/fiji gitter channel thread:
> Thanks ctrueden ! It would be for org.embl.mobie:mobie-viewer-fiji and org.embl.mobie:mobie-io . We haven't written much javadoc for this yet - but if it was possible to view on javadoc.scijava.org, then we'd definitely fill this out more!