fix dashes

Author: fmichonneau

index.md

@@ -30,7 +30,7 @@ And run 'make workshop-check' *before* committing to make sure that changes are
 
 
 {% comment %}
-8< ----------- For a workshop delete from here --------------
+8< ============= For a workshop delete from here =============
 For a workshop please delete the following block until the next dashed-line
 {% endcomment %}
 
@@ -44,7 +44,7 @@ information.
 </div>
 
 {% comment %}
-8< --------------------- until here --------------------------
+8< ============================= until here ==================
 {% endcomment %}