Update alert banner (#11790)

website/data/alert-banner.js

@@ -2,11 +2,12 @@ export const ALERT_BANNER_ACTIVE = true
 
 // https://github.com/hashicorp/web-components/tree/master/packages/alert-banner
 export default {
-  tag: 'Oct 19-21',
-  url: 'https://hashiconf.com/global/?utm_source=DocsBanner',
-  text: 'HashiConf Global is live.',
-  linkText: 'Join Now',
+  tag: 'Blog post',
+  url: 'https://www.hashicorp.com/blog/a-new-chapter-for-hashicorp',
+  text:
+    'HashiCorp shares have begun trading on the Nasdaq. Read the blog from our founders, Mitchell Hashimoto and Armon Dadgar.',
+  linkText: 'Read the post',
   // Set the expirationDate prop with a datetime string (e.g. '2020-01-31T12:00:00-07:00')
   // if you'd like the component to stop showing at or after a certain date
-  expirationDate: '2021-10-20T23:00:00-07:00',
+  expirationDate: '2021-12-17T23:00:00-07:00',
 }