chore: add launch week banner (#477)

gminn · web-flow · commit b7a8a6503678 · 2024-06-07T15:27:11.000-04:00
### Summary

 Launch week is June 24th - 28th 🎉 . This commit adds a banner with the launch week webpage link.

 ### Test Plan

 Visual check + link check.
diff --git a/_data/notifications.yml b/_data/notifications.yml
@@ -0,0 +1,5 @@
+Notification Banner:
+  background: "#141845"
+  textcolor: "#fff"
+  description: |
+    <i> Memfault's Upcoming Launch Week - Product Analytics | June 24th - 28th <a href="https://memfault.com/launch-week/">Join us!</a></i>
