Adding link to Spring Boot roadmap from Java roadmap (#3935)

* Adding link to Spring Boot roadmap from Java roadmap

* Adding link to Spring Boot roadmap from Java roadmap

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Co-authored-by: Abilio Silva <asilva@descartes.com>

src/data/roadmaps/java/content/103-java-web-frameworks/101-spring-boot.md

@@ -4,6 +4,7 @@ Spring Boot is an open source, microservice-based Java web framework. The Spring
 
 Visit the following resources to learn more:
 
+- [Visit Dedicated Spring Boot Roadmap](/spring-boot)
 - [Spring Boot](https://spring.io/projects/spring-boot/)
 - [What is Spring Boot?](https://www.ibm.com/cloud/learn/java-spring-boot)
 - [Spring Boot Tutorial](https://www.javaguides.net/2021/07/spring-boot-tutorial-for-beginners.html)