{index,_includes/head}.html: add href type for Mastodon

Ref: #335

_includes/head.html

@@ -32,6 +32,6 @@
  <meta name="og:image" content="{{site.icon}}"/>
  <meta name="flattr:id" content="7j1ne6">
  <!-- https://indieweb.org/How_to_set_up_web_sign-in_on_your_own_domain#How_to_setup_RelMeAuth - regardless of antipattern, the things I do for verified checkboxes at Mastodon... -->
- <link rel="me" href="https://sauna.social/@aminda" />
- <link rel="me" href="https://mastodon.pirateparty.be/@MikaelaPPFI" />
+ <link rel="me" type="application/activity+json" href="https://sauna.social/users/aminda" />
+ <link rel="me" type="application/activity+json" href="https://mastodon.pirateparty.be/users/MikaelaPPFI" />
 </head>

index.html

@@ -94,10 +94,18 @@ excerpt: "I am a Highly Sensitive Autistic Pirate with Linux experience since 20
       rel="me"
       >git.piraattipuolue.fi</a
     >
-    <a rel="me" href="https://mastodon.pirateparty.be/@MikaelaPPFI"
+    <a
+      rel="me"
+      type="application/activity+json"
+      href="https://mastodon.pirateparty.be/users/MikaelaPPFI"
       >mastodon.pirateparty.be</a
     >
-    <a rel="me" href="https://sauna.social/@aminda">sauna.social</a>
+    <a
+      rel="me"
+      type="application/activity+json"
+      href="https://sauna.social/users/aminda"
+      >sauna.social</a
+    >
   </li>
   <li id="pgp">
     PGP: