Update _footer-main.html

Author: LiamConnors

_includes/layouts/_footer-main.html

@@ -9,7 +9,7 @@ <h6 style="color:#119dff" class="--footer-heading">JOIN OUR MAILING LIST</h6>&#x
             <li>
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-              <a href="https://go.plot.ly/subscription?utm_medium=graphing_libraries&utm_content=footer" class="subscribe-button" target="_blank">
+              <a href="https://plotly.com/newsletter/?utm_medium=graphing_libraries&utm_content=footer" class="subscribe-button" target="_blank">
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               </a>
             </li>