Update _layouts/default.html

Co-authored-by: Simon Li <[email protected]>

Author: Carreau

_layouts/default.html

@@ -41,7 +41,7 @@
     url: https://github.com/jupyter/
   - title: Mastodon
     url: https://hachyderm.io/@ProjectJupyter
-  - title: BluSky
+  - title: BlueSky
     url: https://bsky.app/profile/projectjupyter.bsky.social
   - title: YouTube
     url: https://www.youtube.com/@projectjupyter