Adds instructions.md files for the Supabase and Trigger.dev templates and
renders them in the template browser as a new Instructions tab in the
template dialog (fetched from blueprints/<id>/instructions.md, rendered
with a small dependency-free markdown component).
Also removes the placeholder blueprints/ackee/instructions.md so it does
not surface as an empty Instructions tab.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
