chore: Remove unused method scriptGenerator (#4671)

app/javascript/dashboard/helper/scriptGenerator.js

@@ -1,25 +0,0 @@
-export const createMessengerScript = pageId => `
-<script>
-  window.fbAsyncInit = function() {
-    FB.init({
-      appId: "${window.chatwootConfig.fbAppId}",
-      xfbml: true,
-      version: "${window.chatwootConfig.fbApiVersion}"
-    });
-  };
-  (function(d, s, id){
-      var js, fjs = d.getElementsByTagName(s)[0];
-      if (d.getElementById(id)) { return; }
-      js = d.createElement(s); js.id = id;
-      js.src = "//connect.facebook.net/en_US/sdk.js";
-      fjs.parentNode.insertBefore(js, fjs);
-  }(document, 'script', 'facebook-jssdk'));
-
-</script>
-<div class="fb-messengermessageus"
-  messenger_app_id="${window.chatwootConfig.fbAppId}"
-  page_id="${pageId}"
-  color="blue"
-  size="standard" >
-</div>
-`;