sync and refactor docs build

- upgrade Antora to 3.2.0-alpha.2
- remove Antora patch to support linked worktrees
- upgrade Antora Collector to latest alpha
- remove dispatch.sh script (handled by gh run workflow)
- consistently use gh run workflow to trigger workflows
- remove step to publish generated docs (no longer in use)

.github/workflows/deploy-docs.yml

@@ -1,5 +1,8 @@
 name: Deploy Docs
 on:
+  push:
+    branches-ignore: [ gh-pages ]
+    tags: '**'
   repository_dispatch:
     types: request-build-reference # legacy
   schedule: