Improve CTA for case studies

Author: csswizardry

_includes/promo-next.html

@@ -1,8 +1,8 @@
 <article class="[ box  box--highlight ]  mb" data-ui-component="Cross-sell promo">
 
-    <p><strong>Next:</strong> {{ page.next-case-study-title }}</p>
+    <p><strong>Next up:</strong></p>
 
-    <p><a href="{{ page.next-case-study-url }}" class="btn  btn--full">Read next case study</a></p>
+    <p><a href="{{ page.next-case-study-url }}" class="btn  btn--full">{{ page.next-case-study-title }}</a></p>
 
     <p style="text-align: center;"><small><a href="/case-studies/">View all case studies…</a></small></p>