post-to-post pagination and a few spacing tweaks

_includes/layouts/post.njk

@@ -34,4 +34,13 @@ layout: base.njk
 
     {{ content | safe }}
   </article>
+
+  {% set olderPost = collections.posts | getPreviousCollectionItem %}
+  {% set newerPost = collections.posts | getNextCollectionItem %}
+  {% set olderHref = olderPost.url %}
+  {% set newerHref = newerPost.url %}
+  {% set olderTitle = olderPost.data.title %}
+  {% set newerTitle = newerPost.data.title %}
+  {% set inPost = true %}
+  {% include "pagination.njk" %}
 </heading-anchors>

_includes/pagination.njk

@@ -1,17 +1,17 @@
 {% if olderHref or newerHref %}
 <nav aria-label="pagination">
-  <ol class="pagination">
+  <ol class="pagination {% if inPost %}post-pagination{% endif %}">
     {% if olderHref %}
     <li class="older">
       <a href="{{ olderHref }}">
-        <i class="fa-solid fa-hand-point-left" aria-hidden="true"></i> older
+        <i class="fa-solid fa-hand-point-left" aria-hidden="true"></i> {{ olderTitle or "older" }}
       </a>
     </li>
     {% endif %}
     {% if newerHref %}
     <li class="newer">
       <a href="{{ newerHref }}">
-        newer <i class="fa-solid fa-hand-point-right" aria-hidden="true"></i>
+        {{ newerTitle or "newer" }} <i class="fa-solid fa-hand-point-right" aria-hidden="true"></i>
       </a>
     </li>
     {% endif %}