Delete no-service-definition sample

Author: dandavison

hello_nexus/README.md

@@ -12,4 +12,3 @@ The samples in this directory form an introduction to Nexus.
 ### Samples
 
 - [basic](./basic) - Nexus service definition, operation handlers, and calling workflows.
-- [without_service_definition](./without_service_definition) - A Nexus service implementation without a service definition 

hello_nexus/without_service_definition/README.md

@@ -5,7 +5,6 @@
 import hello_nexus.basic.caller.app
 import hello_nexus.basic.caller.workflows
 import hello_nexus.basic.handler.worker
-import hello_nexus.without_service_definition.app
 from tests.hello_nexus.helpers import create_nexus_endpoint, delete_nexus_endpoint