Upgrade to Spring Doc Resources 0.1.3.BUILD-SNAPSHOT

See gh-23679

gradle/docs.gradle

@@ -80,8 +80,8 @@ dokka {
 }
 
 task downloadResources(type: Download) {
-	def version = "0.1.2.RELEASE"
-	src "https://repo.spring.io/release/io/spring/docresources/" +
+	def version = "0.1.3.BUILD-SNAPSHOT"
+	src "https://repo.spring.io/snapshot/io/spring/docresources/" +
 			"spring-doc-resources/$version/spring-doc-resources-${version}.zip"
 	dest project.file("$buildDir/docs/spring-doc-resources.zip")
 	onlyIfModified true
@@ -124,7 +124,7 @@ asciidoctor {
 			'sectnums': '',
 			'source-highlighter=highlight.js',
 			'highlightjsdir=js/highlight',
-			'highlightjs-theme=atom-one-dark-reasonable',
+			'highlightjs-theme=github',
 			stylesdir: "css/",
 			stylesheet: 'stylesheet.css',
 			'spring-version': project.version