Remove link to old gallery that was taken down (#1089)

## Description

Remove link to old gallery that was taken down
diff --git a/README.md b/README.md
index f093ebb..d06e834 100644
--- a/README.md
+++ b/README.md
@@ -3,8 +3,7 @@
 **NOTE**: The Flutter Gallery is now deprecated, and no longer being active maintained.
 
 Flutter Gallery was a resource to help developers evaluate and use Flutter.
-It is now being used primarily for testing. For posterity,  the web version
-remains [hosted here](https://flutter-gallery-archive.web.app).
+It is now being used primarily for testing.
 
 We recommend Flutter developers check out the following resources: