ci: leave the downloads page to the DorkNet site

The server now offers the published builds on its own site (Downloads page,
Latest build on the Quest page), reading the bucket on the internal network.
Drop the standalone index.html and DORKNET_SITE_URL; the bucket needs no
public route or access app of its own.

Jenkinsfile

@@ -12,7 +12,7 @@
 // On a push, only the platforms whose code changed are rebuilt. A manual run
 // picks the platforms with PLATFORMS. See ci/jenkins/README.md.
 //
-// Finished builds are renamed for players and published to the downloads page
+// Finished builds are renamed for players and published to the downloads bucket
 // (ci/downloads) unless PUBLISH_DOWNLOADS is off. The build scripts keep their
 // own file names, which the launcher depends on.
 
@@ -22,7 +22,7 @@ def PC_VERSION_KEY = 'march_2023_03_21'
 def PC_DEFAULT_TAGS = 'manifest=7490748483298966814'   // Steam 2023-03-21 (appVersion 20230317)
 def QUEST_DEFAULT_TAGS = 'version-code=2128210'        // Quest 20230317
 
-// How this branch's builds are listed on the downloads page.
+// How this branch's builds are listed on the site's Downloads page.
 def RELEASE_ID = '2023.03'
 def RELEASE_TITLE = 'March 2023'
 def RELEASE_GAME_VERSION = '2023-03-21'
@@ -59,7 +59,7 @@ pipeline {
     booleanParam(name: 'LIST_SNAPSHOTS', defaultValue: false,
       description: 'Only list the snapshots matching the tags in both repositories (to find a build), then stop.')
     booleanParam(name: 'PUBLISH_DOWNLOADS', defaultValue: true,
-      description: 'Publish what this run built to the downloads page. Push builds publish too.')
+      description: 'Publish what this run built to the downloads bucket (listed on the site Downloads page). Push builds publish too.')
   }
 
   stages {