finish TOC component

src/pages/[slug].astro

@@ -6,6 +6,9 @@ import Post from '@components/Post.astro';
 export async function getStaticPaths() {
     const entries = await getCollection('posts');
     entries.sort((a, b) => a.data.date.getTime() - b.data.date.getTime())
+
+    // for each route, the page gets passed the entry itself, plus the previous and next slugs
+    // (if any), so that it can render links to them
     return entries.map((entry, idx) => {
         const prevSlug = entries[idx - 1]?.id || null;
         const nextSlug = entries[idx + 1]?.id || null;