feat: add md slug page for individual posts

apps/blog/src/pages/md/[slug].astro

@@ -0,0 +1,22 @@
+---
+import { getCollection, render } from 'astro:content';
+import Layout from '../../layouts/Layout.astro';
+
+export async function getStaticPaths() {
+  const posts = await getCollection('posts');
+  return posts.map(post => ({
+    params: { slug: post.id },
+    props: { post }
+  }));
+}
+
+const { post } = Astro.props;
+const { Content } = await render(post);
+---
+<Layout title={`${post.data.title} - lewis m.w.`}>
+
+<article>
+<h1>{post.data.title}</h1>
+<Content />
+</article>
+</Layout>