refactor: clean up chat and split up embed handling

public/js/embeds/gif.js

@@ -0,0 +1,13 @@
+function embed_gif(link_info) {
+	if (typeof link_info.extension !== "string") {
+		return;
+	}
+
+	const is_gif = get_mime_types(link_info.extension).includes("image/gif");
+
+	if (!is_gif) {
+		return;
+	}
+
+	return `<div class="embed-container image gif"><img src="${link_info.url}" alt="A gif from ${link_info.domain}" /></div>`;
+}