Add img_format=png to imager URLs and extend navbar color picker with 10 new colors

src/lib/imager.ts

@@ -57,6 +57,7 @@ export function getAvatarUrl(
 		direction: String(direction),
 		head_direction: String(headDirection),
 		size,
+		img_format: "png",
 	});
 
 	if (headOnly) params.set("headonly", "1");