fix: course and org landing page improvements (#468)

* make gift section HTML rendered

* hide classroomio branding on landing page

* improve section expanding

* feat: toggle show sections on course landing page

* fix: show discount on landing page course card

supabase/migrations/20240907090948_open_orgplan_for_landingpage.sql

@@ -0,0 +1,8 @@
+drop policy "User must be an org member to SELECT" on "public"."organization_plan";
+
+create policy "Enable read access for all users"
+on "public"."organization_plan"
+as permissive
+for select
+to public
+using (true);