remove a reference to the course publishing step number

Author: hectorsector

responses/14.0_congratulations.md

@@ -2,7 +2,7 @@
 
 Now that your changes are on `master`, you're ready to publish the course.
 
-## Step 15: Publish the course
+## Publish the course
 1. Confirm that you are an owner of the **{{ owner }}** organization, or a member of a team named **lab-assistants** in the **{{ owner }}** organization.
 1. Navigate to https://lab-sandbox.github.com/{{ owner }}/new.
 1. In the Repository name field, type in **{{ repo }}**