Add previous and next blog post section

src/_includes/main/blogpost.njk

@@ -0,0 +1,26 @@
+---
+layout: main/article
+---
+
+{{ content | safe }}
+
+{%- if collections.posts %}
+    {%- set previousPost = collections.posts | getPreviousCollectionItem %}
+    {%- set nextPost = collections.posts | getNextCollectionItem %}
+    {%- if nextPost or previousPost %}
+        <ul class="blog__post--nextprev">
+            {%- if previousPost %}<li>Previous Post: <a href="{{ previousPost.url }}">{{ previousPost.data.articleTitle }}</a></li>{% endif %}
+            {%- if nextPost %}<li>Next Post: <a href="{{ nextPost.url }}">{{ nextPost.data.articleTitle }}</a></li>{% endif %}
+        </ul>
+    {%- endif %}
+{%- endif %}
+
+<style>
+    .blog__post--nextprev {
+        list-style: none;
+        padding-left: 0;
+        padding-top: 0.8em;
+        margin-top: 2.5em;
+        border-top: 0.1em solid var(--clr-title-border);
+    }
+</style>

src/blog/posts/posts.11tydata.json

@@ -1,5 +1,5 @@
 {
-    "layout": "main/article",
+    "layout": "main/blogpost",
     "tags": ["posts", "contents", "feed items"],
     "eleventyComputed": {
         "title": "{{ articleTitle }} | Blog"