Update Mastodon links on old site

v1/content/about.html

@@ -23,7 +23,7 @@ Find me on the Internet in one of these places:
     Aggregator of content related to the <a href="https://www.rust-lang.org/">Rust</a> programming language</li>
   <li><a href="http://www.flickr.com/photos/wezm/">Flickr</a></li>
   <li><a href="https://github.com/wezm">GitHub</a></li>
-  <li><a href="https://decentralised.social/wezm">Mastodon/Fediverse</a></li>
+  <li><a href="https://mastodon.decentralised.social/@wezm">Mastodon/Fediverse</a></li>
   <li><a href="https://patreon.com/wezm">Patreon</a></li>
   <li><a href="http://stackoverflow.com/users/38820/wes">Stack Overflow</a></li>
   <li><a href="https://twitter.com/wezm">Twitter</a></li>

v1/content/technical/2018/01/software-contributions-2017.md

@@ -114,7 +114,7 @@ from.
 * [Jeremy Soller] is creating [Redox OS], an MIT licensed OS written in Rust.
   $60
 * [Gargron] is creating the [Mastodon] federated social network. You can find
-  me at <https://decentralised.social/wezm>. $40
+  me at <https://mastodon.decentralised.social/@wezm>. $40
 * [Jorge Aparicio] is doing fantastic work building Rust tooling and pushing
   the state of the art of [Rust on microcontrollers][embedded-rust]. $35
 * [Steve Wills] does a stack of work on [FreeBSD ports/packages][swills-ports].

v1/layouts/_footer.html

@@ -17,7 +17,7 @@
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       </svg>
     </a>
-    <a href="https://decentralised.social/wezm" rel="me" class="no-border">
+    <a href="https://mastodon.decentralised.social/@wezm" rel="me" class="no-border">
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v1/layouts/article.html

@@ -13,7 +13,7 @@
       <img src="/images/comment.svg" width="32" height="32" alt="Comment icon" class="comment align-top" />
       Stay in touch!
     </h2>
-    <p>Follow me on <a href="https://twitter.com/wezm">Twitter</a> or <a href="https://decentralised.social/wezm">Mastodon</a>, <a href="/feed/">subscribe to the feed</a>, or <a href="mailto:wes@wezm.net">send me an email</a>.
+    <p>Follow me on <a href="https://twitter.com/wezm">Twitter</a> or <a href="https://mastodon.decentralised.social/@wezm">Mastodon</a>, <a href="/feed/">subscribe to the feed</a>, or <a href="mailto:wes@wezm.net">send me an email</a>.
     </p>
   </div>
 </article>