chore: post; tag list improvements; style fixes

src/pages/tag-list.html

@@ -10,8 +10,10 @@ eleventyComputed:
 ---
 {% assign posts = collections[tag] | reverse %}
 {% for post in posts %}
+{% assign author = post.data.link | stripUtm | authorLookup %}
 <article class="h-entry">
   <div class="flex-centered gap-xs icon-small icon-light">
+    {% if author %}{% tablericon "link" "Link" %}{% endif %}
     {% tablericon "calendar-month" "Date" %}
     <time class="dt-published" datetime="{{ post.date }}">
       {{ post.date | date: "%B %e, %Y" }}
@@ -20,7 +22,12 @@ eleventyComputed:
   <a href="{{ post.url }}">
     <h3 class="flex-centered">{{ post.data.title }}</h3>
   </a>
+  {% if author %}via {{ author }}{% endif %}
+  {% if post.data.excerpt %}
   <p class="p-summary">{{ post.data.post_excerpt | markdown }}</p>
+  {% else %}
+  <p class="p-summary">{{ post.data.description | markdown }}</p>
+  {% endif %}
   <p><a href="{{ post.url }}">Read more →</a></p>
 </article>
 {% endfor %}