The /plugins catalog page only pointed at "how to submit" in its empty
state, which nobody sees once the catalog has entries. Add a persistent
"Built a plugin? Submit it to the catalog" link under the hero subtitle
and point both it and the empty-state CTA at the docs section
(plugin-catalog#submitting-a-plugin-to-the-catalog) instead of the raw
GitHub tree, so the submission workflow is one click from the catalog.
82f99a469d