Remove non-existant link to running costs

Author: PabiGamito

popup.html

@@ -45,7 +45,7 @@
         </div>
 
         <div class="support-description">
-          Please consider going <a target="_blank" href="https://linenumbers.app/#/premium">Premium</a> to support the development and <a target="_blank" href="https://linenumbers.app/#/premium#costs">running costs</a> of this extension.
+          Please consider going <a target="_blank" href="https://linenumbers.app/#/premium">Premium</a> to support the development and running costs of this extension.
         </div>
 
         <div class="premium-description">