Remove duplicated variables that can quickly become out-of-sync

Author: sdeleuze

README.adoc

@@ -1,12 +1,6 @@
-:version: 0.9.0
-:repository: release
-:spring-boot-version: 2.4.3
-:graalvm-version: 20.1.0
-:graalvm-dev-version: 20.1.0
-:spring-boot-dev-version: 2.4.4
 :documentation-url: https://docs.spring.io/spring-native/docs/current/reference/htmlsingle
 
-image:https://ci.spring.io/api/v1/teams/spring-native/pipelines/spring-native/badge["Build Status", link="https://ci.spring.io/teams/spring-native/pipelines/spring-native"] image:https://img.shields.io/badge/{version}-documentation-blue.svg["{version} documentation", link="{documentation-url}"]
+image:https://ci.spring.io/api/v1/teams/spring-native/pipelines/spring-native/badge["Build Status", link="https://ci.spring.io/teams/spring-native/pipelines/spring-native"] image:https://img.shields.io/badge/documentation-blue.svg["Reference documentation", link="{documentation-url}"]
 
 Spring Native provides beta support for compiling Spring applications to native executables using https://www.graalvm.org[GraalVM]
 https://www.graalvm.org/reference-manual/native-image/[native-image] compiler, in order to provide a native deployment
@@ -24,8 +18,9 @@ The easiest way to start with Spring Native is probably to go to https://start.s
 
 NOTE: You need to install the GraalVM `native-image` compiler, check {documentation-url}/#getting-started-native-image[the documentation] for more details.
 
-- Download and extract https://github.com/spring-projects-experimental/spring-native/archive/{version}.zip[sources from the latest release].
+- Download https://github.com/spring-projects-experimental/spring-native/tags[the latest release] of this repository.
 - Go into the samples folder and pick one (e.g. `cd samples/commandlinerunner`)
+- Make sure `native-image` is in the `PATH` (usually done by switching on a GraalVM installation with https://sdkman.io/install[SDKMAN]).
 - Run `./build.sh` which will run the regular JVM build, then a native image compilation, then test the result.
 
 For more details on the samples see the {documentation-url}/index.html#samples[samples documentation].
@@ -36,11 +31,6 @@ If you have not previously done so, please sign the https://cla.pivotal.io/sign/
 
 Contributions are welcome, especially for adding support via pull requests for libraries widely used in the Spring ecosystem not yet support. Please refer to the {documentation-url}#how-to-contribute[how to contribute] section for more details.
 
-=== Baseline
-
-The development version on `master` is currently based on GraalVM {graalvm-dev-version} and Spring Boot {spring-boot-dev-version}.
-Mac, Linux and Windows are supported.
-
 == License
 
 https://www.apache.org/licenses/LICENSE-2.0[Apache License v2.0]