chore(ci): eslint + prettier → biome (#325)

site/src/utils/remarkReadingTime.mjs

@@ -1,3 +1,4 @@
+// biome-ignore lint/suspicious/noShadowRestrictedNames: 🤷
 import { toString } from 'mdast-util-to-string';
 import getReadingTime from 'reading-time';
 
@@ -7,7 +8,7 @@ import getReadingTime from 'reading-time';
  * adapted from https://docs.astro.build/en/recipes/reading-time/
  */
 export function remarkReadingTime() {
-  return function (tree, { data }) {
+  return (tree, { data }) => {
     const textOnPage = toString(tree);
     const readingTime = getReadingTime(textOnPage);