Chore: Use installation config in frontend (#847)

* Use installation config in widget
* Add configuration for installation in UI
* Add config for mailer

Co-authored-by: Sojan <sojan@pepalo.com>

app/javascript/widget/store/index.js

@@ -7,6 +7,7 @@ import conversation from 'widget/store/modules/conversation';
 import conversationAttributes from 'widget/store/modules/conversationAttributes';
 import conversationLabels from 'widget/store/modules/conversationLabels';
 import events from 'widget/store/modules/events';
+import globalConfig from 'shared/store/globalConfig';
 import message from 'widget/store/modules/message';
 
 Vue.use(Vuex);
@@ -20,6 +21,7 @@ export default new Vuex.Store({
     conversationAttributes,
     conversationLabels,
     events,
+    globalConfig,
     message,
   },
 });