Fix the Mastodon link

layout/post.html

@@ -12,11 +12,11 @@
             <br />
 
             If you have any questions or comments, then feel free to send me an email
-            (Preferably with <a href="{{ email_gpg_url }}">GPG encryption</a>) to
+            (Preferably with <a href="https://{{ email_gpg_url }}">GPG encryption</a>) to
             {{ email_user }} [weird "a" with a circle] {{ email_domain }}.
 
             <p>
-                This post is signed using my <a href="{{ email_gpg_url }}">public key</a>.
+                This post is signed using my <a href="https://{{ email_gpg_url }}">public key</a>.
                 See <a href=/verify.html>here</a> for more information.
             </p>
         </article>