Workaround duplicate adoc files.

guides/*.adoc are copied to guides/*.adoc and ./ when being processed. This breaks links to JavaScript.
To workaround this, we explicitly state which sources we want to process and avoid the copy found in './'.

See https://github.com/spring-gradle-plugins/spring-build-conventions/issues/80

spring-geode-docs/spring-geode-docs.gradle

@@ -25,6 +25,14 @@ asciidoctorPdf {
 	}
 }
 
+asciidoctor {
+	clearSources()
+	sources {
+		include "index.adoc"
+		include "guides/*.adoc"
+	}
+}
+
 asciidoctorj {
 
 	def githubBaseUrl = "https://github.com/spring-projects/spring-boot-data-geode"