Update links

index.html

@@ -37,7 +37,7 @@ Core support for dependency injection, transaction management, web applications,
 
 ## Introduction
 
-The Spring Framework provides a comprehensive programming and
+The [Spring Framework](https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/overview.html#overview) provides a comprehensive programming and
 configuration model for modern Java-based enterprise applications -
 on any kind of deployment platform. A key element of Spring is
 infrastructural support at the application level: Spring focuses on the
@@ -47,16 +47,13 @@ deployment environments.
 
 ## Features
 
-* Dependency Injection
-* Aspect-Oriented Programming including Spring's declarative transaction management
+* [Core technologies](https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/core.html): dependency injection, events, resources, i18n, validation, data binding, type conversion, SpEL, AOP.
+* [Testing](https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/testing.html): mock objects, TestContext framework, Spring MVC Test, `WebTestClient`.
+* [Data Access](https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/data-access.html#spring-data-tier): transactions, DAO support, JDBC, ORM, Marshalling XML.
 * [Spring MVC](https://docs.spring.io/spring/docs/current/spring-framework-reference/web.html) and
 [Spring WebFlux](https://docs.spring.io/spring/docs/current/spring-framework-reference/web-reactive.html) web frameworks
-* Foundational support for JDBC, JPA, JMS
-* Much more...
-
-All available features and modules are described in [the Modules section of
-the reference documentation](http://docs.spring.io/spring-framework/docs/current/spring-framework-reference/html/overview.html#overview-modules).
-Their [maven/gradle coordinates are also described there](http://docs.spring.io/spring-framework/docs/current/spring-framework-reference/html/overview.html#dependency-management).
+* [Integration](https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/integration.html): remoting, JMS, JCA, JMX, email, tasks, scheduling, cache.
+* [Languages](https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/languages.html): Kotlin, Groovy, dynamic languages.
 
 ## Minimum requirements