update blog url

Author: LiamConnors

_includes/layouts/_footer-main.html

@@ -46,7 +46,7 @@ <h6 style="color:#00cc96" class="--footer-heading">About Us</h6>&#x9;&#x9;&#x9;
             &#x9;&#x9;&#x9;&#x9;
             <li><a href="https://plotly.com/resources/" target="_self">Resources</a></li>
             &#x9;&#x9;&#x9;&#x9;
-            <li><a href="https://medium.com/@plotlygraphs" target="_self">Blog</a></li>
+            <li><a href="https://plotly.com/blog/" target="_self">Blog</a></li>
             &#x9;&#x9;&#x9;&#x9;
           </ul>
         </li>