Update banner for spring launches (#5354)

## What are you changing in this pull request and why?

Linking to the spring launch event in our banner

## Checklist
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Adding or removing pages (delete if not applicable):
- [ ] Add/remove page in `website/sidebars.js`
- [ ] Provide a unique filename for new pages
- [ ] Add an entry for deleted pages in `website/vercel.json`
- [ ] Run link testing locally with `npm run build` to update the links
that point to deleted pages

---------

Co-authored-by: Mirna Wong <[email protected]>

website/docusaurus.config.js

@@ -71,14 +71,14 @@ var siteSettings = {
     },
     announcementBar: {
       id: "biweekly-demos",
-      content: "Join our bi-weekly demos and see dbt Cloud in action!",
+      content: "Join us on May 14th for the dbt Cloud Launch Showcase event. Discover the latest innovations and watch live demos! ",
       backgroundColor: "#047377",
       textColor: "#fff",
       isCloseable: true,
     },
     announcementBarActive: true,
     announcementBarLink:
-      "https://www.getdbt.com/resources/dbt-cloud-demos-with-experts?utm_source=docs&utm_medium=event&utm_campaign=q1-2024_cloud-demos-with-experts_awareness",
+      "https://www.getdbt.com/resources/webinars/dbt-cloud-launch-showcase",
     // Set community spotlight member on homepage
     // This is the ID for a specific file under docs/community/spotlight
     communitySpotlightMember: "alison-stanton",