docs: redesigned announcement bar (#2559)

www/docs/announcement.json

@@ -1 +1 @@
-{"id":"release-v1-6-0","content":"New Release! Version v1.6.0 of Medusa is out now! Read all about it <a href='https://github.com/medusajs/medusa/releases/tag/v1.6.0'>here</a>.","backgroundColor":"#7C53FF","textColor":"#fff","isCloseable":false}
+{"id":"https://github.com/medusajs/medusa/releases/tag/v1.6.0","content":"v1.6.1 is out","isCloseable":true}