Deleting all apps apart from those used in Ch1 and Ch2 labs

Ravi Srinivasan

2019-06-07 a387a34d242c2bb5e70d1527c441f8f7b3f4bc6b

nexus3/uid_entrypoint does not exist in tree d1e8d83067d3751de1c50a264e1435a5e075bbd5