fix: narrow docs-preview workflow path filter (#515)

The docs-preview workflow triggered on all source code changes due to
the broad `packages/*/src/data_designer/**` path glob. This caused
unnecessary Cloudflare Pages deployments on code-only PRs like #505.

Remove the source code path filter so the workflow only triggers on
actual docs content changes (docs/**, mkdocs.yml, and the workflow
file itself).

Author: andreatgretel

.github/workflows/docs-preview.yml

@@ -6,7 +6,6 @@ on:
     paths:
       - "docs/**"
       - "mkdocs.yml"
-      - "packages/*/src/data_designer/**"
       - ".github/workflows/docs-preview.yml"
 
 jobs: