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

src/lib/imager.test.ts

@@ -34,5 +34,6 @@ describe("getAvatarUrl", () => {
 		expect(url).toContain("size=l");
 		expect(url).toContain("headonly=1");
 		expect(url).toContain("direction=2");
+		expect(url).toContain("img_format=png");
 	});
 });