Remove release trigger from docs workflow

The github-pages environment only allows deployments from the main
branch. Release events use tag refs which don't match that policy,
causing every release-triggered docs deploy to fail. Since pushes to
main already trigger docs deployment, the release trigger is redundant.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: gmr

.github/workflows/docs.yaml

@@ -7,8 +7,6 @@ on:
       - 'docs/**'
       - 'mkdocs.yml'
       - 'rejected/**'
-  release:
-    types: [published]
   workflow_dispatch:
 
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