Adds marketing section and newsletter process to admin page

Author: KeiranWDigital

admin.html

@@ -27,5 +27,9 @@ <h4><a href="{{site.url}}/availability-process">Availability Spreadsheet</a></h4
         <h4><a href="https://forms.gle/HDu49ukTBM6uLpBCA" target="_blank">Event Request/Kick-Off Form</a></h4>
         <h4><a href="{{site.url}}/event-process">Event Process</a></h4>
         <h4><a href="https://docs.google.com/spreadsheets/d/1khRdEN3QSD9yQnv9zz_TshaJ4QcczEtEoy1BAv6_UKU/edit?usp=sharing" target="_blank">Feedback from Attendees</a></h4>
+
+        <h2>Marketing</h2>
+        <h4><a href="{{site.url}}/newsletter-process">Newsletter Process</a></h4>
+
     </div>
 </div>