Update issue and PR templates

Author: sdeleuze

.github/ISSUE_TEMPLATE.md

@@ -1,5 +1,5 @@
 <!--
-Welcome to the spring-native issue tracker. If you think you found a bug, please take the time to provide a complete minimal sample (something that we can unzip or git clone, build, and deploy) that reproduces the problem.
+Spring Native is now superseded by Spring Boot 3 official native support, see [the related reference documentation](https://docs.spring.io/spring-boot/docs/current/reference/html/native-image.html) for more details.
 
-If you have a question, [StackOverflow](https://stackoverflow.com/tags/spring-native) is the place to be. We prefer to use GitHub issues only for bugs and enhancements.
+As a consequence, no new issue on this project should be created, and we recommend trying your use case with the latest Spring Boot 3 version. If you still experience the issue reported here, please open an issue directly on the related Spring project (Spring Framework, Data, Security, Boot, Cloud, etc.) with a reproducer.
 -->

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,5 @@
+<!--
+Spring Native is now superseded by Spring Boot 3 official native support, see [the related reference documentation](https://docs.spring.io/spring-boot/docs/current/reference/html/native-image.html) for more details.
+
+As a consequence, no new issue on this project should be created, and we recommend trying your use case with the latest Spring Boot 3 version. If you still experience the issue reported here, please open an issue directly on the related Spring project (Spring Framework, Data, Security, Boot, Cloud, etc.) with a reproducer.
+-->