Use RESTEasy Reactive when in getting-started-reactive-crud example
Use RESTEasy Reactive when in getting-started-reactive-crud example

It was brought to my attention that this guide was a little confusing
because it first used RESTEasy Reactive then RESTEasy Classic.
This change aims to clear the confusion by using the former for
both parts that use JAX-RS.

quarkusio/quarkus,quarkusio/quarkus,quarkusio/quarkus,quarkusio/quarkus,quarkusio/quarkus