diff --git a/src/Pure/Admin/isabelle_devel.scala b/src/Pure/Admin/isabelle_devel.scala
--- a/src/Pure/Admin/isabelle_devel.scala
+++ b/src/Pure/Admin/isabelle_devel.scala
@@ -1,92 +1,76 @@
 /*  Title:      Pure/Admin/isabelle_devel.scala
     Author:     Makarius
 
 Website for Isabelle development resources.
 */
 
 package isabelle
 
 
 object Isabelle_Devel
 {
   val RELEASE_SNAPSHOT = "release_snapshot"
   val BUILD_LOG_DB = "build_log.db"
   val BUILD_STATUS = "build_status"
   val CRONJOB_LOG = "cronjob-main.log"
 
   val root = Path.explode("~/html-data/devel")
   val cronjob_log = root + Path.basic(CRONJOB_LOG)
 
 
   /* index */
 
   def make_index()
   {
-    val header = "Isabelle Development Resources"
+    val redirect = "https://isabelle-dev.sketis.net/home/menu/view/20"
 
     HTML.write_document(root, "index.html",
-      List(HTML.title(header)),
-      List(HTML.chapter(header),
-        HTML.itemize(
-          List(
-            HTML.text("Isabelle nightly ") :::
-            List(HTML.link(RELEASE_SNAPSHOT, HTML.text("release snapshot"))) :::
-            HTML.text(" (for all platforms)"),
-
-            HTML.text("Cronjob ") ::: List(HTML.link(CRONJOB_LOG, HTML.text("log file"))),
-
-            HTML.text("Isabelle ") :::
-            List(HTML.link(BUILD_STATUS + "/index.html", HTML.text("build status"))) :::
-            HTML.text(" information"),
-
-            HTML.text("Database with recent ") :::
-            List(HTML.link(BUILD_LOG_DB, HTML.text("build log"))) :::
-            HTML.text(" information (e.g. for ") :::
-            List(HTML.link("https://sqlitebrowser.org",
-              List(HTML.code(HTML.text("sqlitebrowser"))))) :::
-            HTML.text(")")))))
+      List(
+        XML.Elem(Markup("meta",
+          List("http-equiv" -> "Refresh", "content" -> ("0; url=" + redirect))), Nil)),
+      List(HTML.link(redirect, HTML.text("Isabelle Development Resources"))))
   }
 
 
   /* release snapshot */
 
   def release_snapshot(
     options: Options,
     rev: String = "",
     afp_rev: String = "",
     parallel_jobs: Int = 1)
   {
     Isabelle_System.with_tmp_dir("isadist")(base_dir =>
       {
         Isabelle_System.update_directory(root + Path.explode(RELEASE_SNAPSHOT),
           website_dir =>
             Build_Release.build_release(base_dir, options, rev = rev, afp_rev = afp_rev,
               parallel_jobs = parallel_jobs,
               build_sessions = List(Isabelle_System.getenv("ISABELLE_LOGIC")),
               website = Some(website_dir)))
       })
   }
 
 
   /* maintain build_log database */
 
   def build_log_database(options: Options, log_dirs: List[Path])
   {
     val store = Build_Log.store(options)
     using(store.open_database())(db =>
     {
       store.update_database(db, log_dirs)
       store.update_database(db, log_dirs, ml_statistics = true)
       store.snapshot_database(db, root + Path.explode(BUILD_LOG_DB))
     })
   }
 
 
   /* present build status */
 
   def build_status(options: Options)
   {
     Isabelle_System.update_directory(root + Path.explode(BUILD_STATUS),
       dir => Build_Status.build_status(options, target_dir = dir, ml_statistics = true))
   }
 }