feat: show post's medium.com url

templates/main.css

@@ -117,6 +117,11 @@ iframe {
   display: inline-flex;
 }
 
+.medium__source {
+  font-style: italic;
+}
+
+
 .author {
   display: inline-flex;
   flex-direction: row;

templates/post.html

@@ -16,7 +16,11 @@
           />
           <.= data.creator.name .></a
         >
-        on <.= &date .> &#183; <.= reading_time .> min read
+        on <.= &date .> &#183; <.= reading_time .> min read &#183;&nbsp;
+      <a class="medium__source" 
+          href="https://medium.com/<.= data.creator.id .>/<.= data.unique_slug .>" 
+          rel="noreferrer"> Open post in medium.com</a>
+
       </p>
       <article>
         <. let paragraphs = &data.content.body_model.paragraphs; .>