Update _header-main.html

Author: LiamConnors

_includes/layouts/_header-main.html

@@ -6,7 +6,7 @@
     </div>
     <div class="close-menu"></div>
     <ul>
-        <li><a class="download-studio-btn" style="display: inline-block; font-weight: bold; background: #7A76FF; color: white !important; padding: 8px 16px; border-radius: 8px; text-decoration: none; transition: background 0.3s ease;" href="https://plotly.com/studio">Download Studio</a></li>
+        <li><a class="download-studio-btn" style="display: inline-block; font-weight: bold; background: #7A76FF; color: white !important; padding: 8px 16px; border-radius: 8px; text-decoration: none; transition: background 0.3s ease;" href="https://plotly.com/studio?utm_medium=graphing_libraries">Download Studio</a></li>
         <li><a style="font-weight: bold;" href="https://plotly.com/pricing">Studio and Cloud Pricing</a></li>
         <li><a style="font-weight: bold;" href="https://plotly.com/get-pricing">Dash Enterprise Pricing</a></li>
         <!--<li><a style="font-weight: bold;" href="http://plotly.cloud">Dash Cloud</a></li>-->
@@ -125,7 +125,7 @@
                             </ul>
 
                         </li>
-                        <li><a class="download-studio-btn" style="display: inline-block; font-weight: bold; background: #7A76FF; color: white !important; padding: 8px 16px; border-radius: 8px; text-decoration: none; transition: background 0.3s ease;" href="https://plotly.com/studio">Download Studio</a></li>
+                        <li><a class="download-studio-btn" style="display: inline-block; font-weight: bold; background: #7A76FF; color: white !important; padding: 8px 16px; border-radius: 8px; text-decoration: none; transition: background 0.3s ease;" href="https://plotly.com/studio?utm_medium=graphing_libraries">Download Studio</a></li>
                         <li><a style="font-weight: bold;" href="https://plotly.com/pricing">Studio and Cloud Pricing</a></li>
                         <li><a style="font-weight: bold;" href="https://plotly.com/get-pricing">Dash Enterprise Pricing</a></li>
                         <!--<li><a style="font-weight: bold;" href="http://plotly.cloud">Dash Cloud</a></li>-->