fix: Don’t offer Markdown equivalents of HTML pages

Author: csswizardry

_layouts/page.html

@@ -12,8 +12,10 @@
 
             <h1 elementtiming="page-title">{{ page.title }}</h1>
 
-            {% assign markdown_source = site.markdown_source_base | append: page.path %}
-            <p class=hide><a href="{{ markdown_source }}">View this page as Markdown.</a></p>
+            {% if page.path contains ".md" %}
+              <p class=hide><a href="{{ site.markdown_source_base }}{{ page.path }}">View this page as Markdown.</a></p>
+            {% endif %}
+
 
             {{ content }}
 

_layouts/post.html

@@ -38,8 +38,9 @@ <h1 itemprop="name  headline" elementtiming=page-title style="view-transition-na
 
           <p class=hide>Written by <b itemprop=author>Harry Roberts</b> on <b itemprop=publisher>CSS Wizardry</b>.</p>
 
-          {% assign markdown_source = site.markdown_source_base | append: page.path %}
-          <p class=hide><a href="{{ markdown_source }}">View this page as Markdown.</a></p>
+          {% if page.path contains ".md" %}
+            <p class=hide><a href="{{ site.markdown_source_base }}{{ page.path }}">View this page as Markdown.</a></p>
+          {% endif %}
 
           {% if page.case-study != true %}