Extract contact email address variable

_config.yml

@@ -1,3 +1,4 @@
+contact_email: contact@coops.tech
 collections:
   coops:
     output: true

index.html

@@ -100,9 +100,9 @@ layout: home
       <h2>Get In Touch</h2>
       <p>
         If you would like to work with us, or find out more,
-        <a href="mailto:contact@coops.tech">get in touch</a>.
+        <a href="mailto:{{ site.contact_email }}">get in touch</a>.
         <br/> Not sure which tech coop, or coops, are right for you? Drop us a message at
-        <a href="mailto:contact@coops.tech">contact@coops.tech</a>, and we will help you find the perfect match.
+        <a href="mailto:{{ site.contact_email }}">{{ site.contact_email }}</a>, and we will help you find the perfect match.
       </p>
 
     </div>

join.html

@@ -36,7 +36,7 @@ layout: default
   <section id="join-form">
     <div class="row">
       <div class="small-12 medium-6 small-centered columns">
-        <p>Contact us via <a href="mailto:contact@coops.tech">contact@coops.tech</a>.</p>
+        <p>Contact us via <a href="mailto:{{ site.contact_email }}">{{ site.contact_email }}</a>.</p>
       </div>
     </div>
   </section>