Update spring-doc-resources version and highlight

Update to pick up the latest look and feel and better highlighting.

Author: Jay Bryant

docs/build.gradle

@@ -21,7 +21,7 @@ dependencies {
 }
 
 ext {
-	docResourcesVersion = '0.1.3.RELEASE'
+	docResourcesVersion = '0.2.0.RELEASE'
 }
 
 tasks.findByPath("artifactoryPublish")?.enabled = false
@@ -92,7 +92,7 @@ asciidoctor {
 		// use provided highlighter
 		'source-highlighter=highlight.js',
 		'highlightjsdir=js/highlight',
-		'highlightjs-theme=atom-one-dark-reasonable',
+		'highlightjs-theme=github',
 		'idprefix': '',
 		'idseparator': '-',
 		'spring-version': project.version,