unlisting cloud sync blog post (microsoft#8408)

Author: eanders-ms

docs/blog.md

@@ -1,11 +1,5 @@
 # Microsoft MakeCode Blog
 
-## [Introducing Cloud Sync for MakeCode Arcade](/blog/arcade/intro-cloud-sync)
-
-August 12th, 2021 by [eanders-ms](https://github.com/eanders-ms)
-
-Over the past year we've been working hard to bring you the ability to sign into MakeCode with a [Microsoft Account](https://aka.ms/AAdd6f8). When you sign into MakeCode, you make it possible for us to remember who you, and this unlocks a bunch of exciting new possibilities.
-
 **[Continue reading this blog post](/blog/arcade/intro-cloud-sync)**
 
 ## [MakeCode for the micro:bit - 2021 Release is here!](/blog/microbit/2021-release)

docs/blog/SUMMARY.md

@@ -1,7 +1,6 @@
 # Microsoft MakeCode Blog
 
 * [Blog](/blog)
-    * [Introducing Cloud Sync for MakeCode Arcade](/blog/arcade/intro-cloud-sync)
     * [MakeCode for the micro:bit - 2021 Release is here!](/blog/microbit/2021-release)
     * [Beginner Skillmap Has Launched!](/blog/arcade/beginner-skillmap)
     * [New Free Curriculum! AP CSP with MakeCode](/blog/csp/new-free-curriculum)