Release 3.0.0-rc-1: update sitemap
diff --git a/site/src/site/sitemap-user.groovy b/site/src/site/sitemap-user.groovy
index 43179ef..16400fe 100644
--- a/site/src/site/sitemap-user.groovy
+++ b/site/src/site/sitemap-user.groovy
@@ -90,7 +90,7 @@
             '2.5.0-rc-1', '2.5.0-rc-2', '2.5.0-rc-3', '2.5.0', '2.5.1', '2.5.2', '2.5.3', '2.5.4', '2.5.5', '2.5.6', '2.5.7', '2.5.8',
             '2.6.0-alpha-1', '2.6.0-alpha-2', '2.6.0-alpha-3', '2.6.0-alpha-4',
             '3.0.0-alpha-1', '3.0.0-alpha-2', '3.0.0-alpha-3', '3.0.0-alpha-4', '3.0.0-beta-1', '3.0.0-beta-2',
-            '3.0.0-beta-3'
+            '3.0.0-beta-3', '3.0.0-rc-1'
     ])
 
     section('Getting started','fa-graduation-cap') {
@@ -149,8 +149,13 @@
             a(href: 'versioning.html', 'version')
             yield ' of Groovy designed for JDK8+ and with the new Parrot parser enabled by default. Pre-stable versions are available:'
         }
+        version('3.0.0-rc-1') {
+            stable false
+//            windowsInstaller 'https://dl.bintray.com/groovy/Distributions/groovy-3.0.0-rc-1-installer.exe'
+        }
         version('3.0.0-beta-3') {
             stable false
+            archive true
             windowsInstaller 'https://dl.bintray.com/groovy/Distributions/groovy-3.0.0-beta-3-installer.exe'
         }
     }