Move webui from /loop/webui to /webui

Thanks, perl (and git mv):

	perl -pi -e s,loop/webui,webui,g $(git grep -l loop/webui)
diff --git a/cmd/bundle-analyzer/main.go b/cmd/bundle-analyzer/main.go
index 2910a7e..6f35833 100644
--- a/cmd/bundle-analyzer/main.go
+++ b/cmd/bundle-analyzer/main.go
@@ -8,7 +8,7 @@
 	"os"
 	"path/filepath"
 
-	"sketch.dev/loop/webui"
+	"sketch.dev/webui"
 )
 
 func main() {