Theme: Add HubSpot tracking code

Author: fdabrandao

_templates/ampl-pages.html

@@ -9,6 +9,9 @@
 <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-WDR59JC"
 height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
 <!-- End Google Tag Manager (noscript) -->
+<!-- Start of HubSpot Embed Code -->
+<script type="text/javascript" id="hs-script-loader" async defer src="//js-na2.hs-scripts.com/242326847.js"></script>
+<!-- End of HubSpot Embed Code -->
 
 <div class="dropdown-header">AMPL Resources</div>
 <li><a class="btn btn-sm dropdown-item" href="https://ampl.com/"><i class="fas fa-home fa-fw fa-lg"></i> AMPL.com</a></li>