feat(docs): Add email link to footer

docs/assets/styles/main.scss

@@ -210,7 +210,16 @@ ul.contents-list {
             list-style-type: none;
             padding-left: 0;
             li {
-                margin: 6px 0;
+                margin: 12px 0;
+            }
+        }
+        .email-link {
+            display: flex;
+            align-items: center;
+            img {
+                width: 24px;
+                height: 24px;
+                margin-right: 6px;
             }
         }
     }

docs/layouts/partials/footer.html

@@ -7,6 +7,7 @@
                 <li><a href="https://github.com/vendure-ecommerce/vendure">GitHub</a></li>
                 <li><a href="https://www.npmjs.com/~vendure">npm</a></li>
                 <li><a href="https://twitter.com/vendure_io">Twitter</a></li>
+                <li><a href="mailto:contact@vendure.io" class="email-link"><img src="{{ "svg/clr-icon-email-light.svg" | absURL }}"> contact@vendure.io</a></li>
             </ul>
         </div>
         <div class="copyright">