updated links

README.md

@@ -8,7 +8,6 @@ For further reference, please consider the following sections:
 
 * [Spring Boot Gradle Plugin Reference Guide](https://docs.spring.io/spring-boot/docs/current/gradle-plugin/reference/htmlsingle/)
 * [Create an OCI image](https://docs.spring.io/spring-boot/docs/3.1.3/maven-plugin/reference/html/#build-image)
-* [gRPC](https://grpc.io/)
 * [Spring Boot Actuator](https://docs.spring.io/spring-boot/docs/3.1.3/reference/htmlsingle/index.html#actuator)
 * [Spring Boot Web](https://docs.spring.io/spring-boot/docs/current/reference/html/web.html)
 * [springdoc-openapi](https://springdoc.org/)
@@ -24,9 +23,7 @@ The following guides illustrate how to use some features:
 * [Building a RESTful Web Service with Spring Boot Actuator](https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#actuator)
 * [Validating Form Input](https://spring.io/guides/gs/validating-form-input/)
 * [Documenting a Spring REST API Using OpenAPI 3.0](https://www.baeldung.com/spring-rest-openapi-documentation)
-* [gRPC-Spring-Boot-Starter Documentation](https://yidongnan.github.io/grpc-spring-boot-starter/en/)
 * [SAML with Spring Boot and Spring Security](https://www.baeldung.com/spring-security-saml)
-* [Technical Dokumentation](https://wiki.mgm-tp.com/confluence/x/dwMkEw)
 * [Keycloak Configuration](https://git.ozg-sh.de/ozgcloud-app/antragsraum-server/src/branch/dev/documentation/KeycloakSetup.md)
 * [BayernId Implementation and configuration](documentation/BayernIdLogin.md)