Twitter now uses the correct icon

CoreUI Brands don't have the modern X icon, but does anyone really care? We may add a custom X icon in the future.

src/components/setpieces/Footer.astro

@@ -43,7 +43,7 @@ import { t } from "i18next";
 						href={site.twitter.handle.link}
 						target="_blank"
 						type="twitter is-rounded"
-						icon="cib:github"
+						icon="cib:twitter"
 						titleKey="button-twitter"
 					/>
 					<Button