Enable hiding/showing build steps

README.adoc

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-[[scratch]]
-== Set up the project
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-include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/build_system_intro.adoc[]
+include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/hide-show-maven.adoc[]
 
-include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/create_directory_structure_hello.adoc[]
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-`build.gradle`
-// AsciiDoc source formatting doesn't support groovy, so using java instead
-[source,java]
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-include::initial/build.gradle[]
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-NOTE: There are several comments embedded in this build file. They are used to extract out fragments for more detailed explanation further down in this guide.
+include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/hide-show-sts.adoc[]
 
 == Learn what you can do with Spring Boot