import new flairs from lichess spreadshop (#14345)

* add spreadshop flairs to list.txt

* import new flairs from lichess spreadshop

* delete dirty webp

* Delete public/flair/img/activity.lichess-mohawk.webp

* delete old dirty glitchsey

* add cleaner spreadshop flairs

public/flair/list.txt

@@ -47,8 +47,11 @@ activity.lichess-blitz
 activity.lichess-bullet
 activity.lichess-classical
 activity.lichess-correspondence
+activity.lichess-glitchsey
 activity.lichess-hogger
 activity.lichess-horsey
+activity.lichess-horsey-yin-yang
+activity.lichess-mohawk
 activity.lichess-rapid
 activity.lichess-ultrabullet
 activity.lichess-variant-960