Adds latest video

www/_blog/2021-05-03-supabase-beta-april-2021.mdx

@@ -23,13 +23,12 @@ Watch a full demo:
   className="w-full video-with-border"
   width="640"
   height="385"
-  src="https://www.youtube-nocookie.com/embed/TtLxxaYE1rA"
+  src="https://www.youtube-nocookie.com/embed/uWJmUTCFdak"
   frameBorder="1"
   allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
   allowFullScreen
 ></iframe>
 
-
 ## Light Mode
 
 We're a developer tool, which means that Dark Mode is [extremely popular](https://twitter.com/supabase_io/status/1388131942919376904).