use CTA for signup

_data/ctas/newsletter.yml

@@ -0,0 +1,5 @@
+text: Ready for a glimpse into the future?<br>Together we make InvenTree better, faster and more helpfull each day.
+btn:
+  - text: Sign up
+    link:
+      internal: newsletter.md

index.md

@@ -23,5 +23,7 @@ main_page: True
 
 {% include partial/newsletter.html %}
 
+{% include block/cta.html cta=site.data.ctas.newsletter %}
+
 {% include block/cta.html cta=site.data.ctas.end %}
 

newsletter.md

@@ -0,0 +1,6 @@
+---
+layout: default
+backLink: false
+---
+
+{% include partial/newsletter.html %}