feat: make author clickable

lib/thumbhash.ts

@@ -1,7 +1,8 @@
 import * as thumbhash from "https://esm.sh/thumbhash@0.1.1";
 
 export function generateThumbhash(buffer: Uint8Array, w: number, h: number) {
-  return thumbhash.rgbaToThumbHash(w, h, buffer);
+  const hash = thumbhash.rgbaToThumbHash(w, h, buffer);
+  return [hash, thumbhash.thumbHashToAverageRGBA(hash)] as const;
 }
 
 export function generateDataURL(hash: string) {