Move badges to header

This is similar to Spring Boot:
  https://github.com/spring-projects/spring-boot/blob/main/README.adoc

Author: Steve Riesenberg

README.adoc

@@ -1,10 +1,4 @@
-image::https://badges.gitter.im/Join%20Chat.svg[Gitter,link=https://gitter.im/spring-projects/spring-security?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge]
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-image::https://github.com/spring-projects/spring-authorization-server/workflows/CI/badge.svg?branch=main["Build Status", link="https://github.com/spring-projects/spring-authorization-server/actions?query=workflow%3ACI"]
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-image::https://img.shields.io/badge/Revved%20up%20by-Gradle%20Enterprise-06A0CE?logo=Gradle&labelColor=02303A["Revved up by Gradle Enterprise", link="https://ge.spring.io/scans?&search.rootProjectNames=spring-authorization-server"]
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-= Spring Authorization Server
+= Spring Authorization Server image:https://badges.gitter.im/Join%20Chat.svg[Gitter,link=https://gitter.im/spring-projects/spring-security?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge] image:https://github.com/spring-projects/spring-authorization-server/workflows/CI/badge.svg?branch=main["Build Status", link="https://github.com/spring-projects/spring-authorization-server/actions?query=workflow%3ACI"] image:https://img.shields.io/badge/Revved%20up%20by-Gradle%20Enterprise-06A0CE?logo=Gradle&labelColor=02303A["Revved up by Gradle Enterprise", link="https://ge.spring.io/scans?&search.rootProjectNames=spring-authorization-server"]
 
 The Spring Authorization Server project, led by the https://spring.io/projects/spring-security/[Spring Security] team, is focused on delivering https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-07#section-1.1[OAuth 2.1 Authorization Server] support to the Spring community.