replace all www.graphql-java-kickstart.com urls with github.io versions

Author: oliemansm

.github/workflows/publish.yml

@@ -30,4 +30,3 @@ jobs:
           external_repository: graphql-java-kickstart/graphql-java-kickstart.github.io
           publish_branch: master
           publish_dir: ./public
-          cname: www.graphql-java-kickstart.com

README.md

@@ -1,4 +1,4 @@
-# [GraphQL Java Kickstart Documentation](https://www.graphql-java-kickstart.com/)
+# [GraphQL Java Kickstart Documentation](https://graphql-java-kickstart.github.io/)
 
 
 [![GitHub CI Workflow](https://github.com/graphql-java-kickstart/documentation/actions/workflows/publish.yml/badge.svg?branch=master)](https://github.com/graphql-java-kickstart/documentation/actions/workflows/publish.yml?query=branch%3Amaster)

content/servlet/_index.md

@@ -123,7 +123,7 @@ The servlet supports the following request formats:
 
 ## Spring Framework support
 
-To use the servlet with Spring Framework, either use the [Spring Boot starter](https://www.graphql-java-kickstart.com/spring-boot/) or simply define a `ServletRegistrationBean` in a web app:
+To use the servlet with Spring Framework, either use the [Spring Boot starter](https://graphql-java-kickstart.github.io/spring-boot/) or simply define a `ServletRegistrationBean` in a web app:
 
 ```java
 @Bean