fix: render time in frontmatter

Author: coderdiaz

src/lib/remark.mjs

@@ -0,0 +1,12 @@
+import getReadingTime from 'reading-time';
+import { toString } from 'mdast-util-to-string';
+
+export function remarkReadingTime() {
+  return function (tree, { data }) {
+    const textOnPage = toString(tree);
+    const readingTime = getReadingTime(textOnPage);
+    // readingTime.text will give us minutes read as a friendly string,
+    // i.e. "3 min read"
+    data.astro.frontmatter.minutesRead = readingTime.text;
+  };
+}