Add: "More" links after post summaries (#391)

* Add: "More" links after post summaries

Closes #392.

* Align with PDST

---------

Co-authored-by: Stefan van der Walt <stefanv@berkeley.edu>

Author: alphapapa

assets/theme-css/posts.css

@@ -85,6 +85,10 @@ div.MathJax_Display {
   margin: 0.5em;
 }
 
+.read-more {
+  font-style: italic;
+}
+
 .tag-cloud {
   position: sticky;
   align-self: flex-start;

layouts/partials/posts/summary.html

@@ -3,5 +3,8 @@
   {{ with $featuredImage }}
   <img src="{{ .RelPermalink }}" {{ if .Params.description }}alt="{{ .Params.description }}"{{ end }}/>
   {{ end }}
-  {{ .Summary }}
+  {{ strings.Chomp .Summary }}
+  <span class="read-more">
+      <a href="{{ .RelPermalink }}">Read more...</a>
+  </span>
 </div>