Remove the now unused _data/core-team.yml and the relevant scss. (#24593)

Author: XhmikosR

_data/core-team.yml

@@ -44,7 +44,6 @@
 @import "buttons";
 @import "callouts";
 @import "examples";
-@import "team";
 @import "browser-bugs";
 @import "brand";
 @import "colors";