Added ArticleFooter and SequenceNav

src/components/post/Footer/ArticleFooter.astro

@@ -0,0 +1,17 @@
+---
+import type { Sequence } from '@/lib/site/navigation'
+
+import SequenceNav from './SequenceNav.astro'
+
+type Props = {
+  sequence: Sequence | null
+}
+
+const { sequence } = Astro.props
+---
+
+{sequence && (
+  <footer class="article-footer">
+    <SequenceNav sequence={sequence} />
+  </footer>
+)}