add: folder structure for markdown content pages

src/pages/guides/[...slug].astro

@@ -0,0 +1,23 @@
+---
+import { getCollection } from 'astro:content'
+
+import PageLayout from '../../layouts/PageLayout.astro'
+
+export async function getStaticPaths() {
+    const blogEntries = await getCollection('guides')
+    return blogEntries.map(entry => ({
+        params: { slug: entry.slug },
+        props: { entry },
+    }))
+}
+
+const { entry } = Astro.props
+const { Content } = await entry.render()
+---
+
+<h1>{entry.data.title}</h1>
+{entry.data.series && <h2>{entry.data.series}</h2>}
+
+<PageLayout title={entry.data.title} description={entry.data.description} pageName={['guide', entry.slug]}>
+    <Content />
+</PageLayout>