docs: add ability to dismiss announcement

Signed-off-by: heitorlessa <[email protected]>

Author: heitorlessa

mkdocs.yml

@@ -90,6 +90,7 @@ theme:
     - content.code.annotate
     - content.code.copy
     - content.tabs.link
+    - announce.dismiss
   icon:
     repo: fontawesome/brands/github
   logo: media/aws-logo-light.svg