Update author links

index.html

@@ -176,19 +176,19 @@ <h2 class="block-title">Made by people</h2>
             Protecting privacy on the web is important. We hope you enjoy Ka-Block!
           </p>
           <div class="author-info">
-            <a href="https://twitter.com/davidgraham">
+            <a href="https://github.com/dgraham">
               <img class="avatar" src="https://github.com/dgraham.png?s=200" alt="David Graham">
             </a>
             <h3 class="author-name">David Graham</h3>
-            <a class="author-link" href="https://twitter.com/davidgraham">@davidgraham</a>
+            <a class="author-link" href="https://github.com/dgraham">@dgraham</a>
           </div>
 
           <div class="author-info">
-            <a href="https://twitter.com/joshpeek">
+            <a href="https://github.com/josh">
               <img class="avatar" src="https://github.com/josh.png?s=200" alt="Josh Peek">
             </a>
             <h3 class="author-name">Josh Peek</h3>
-            <a class="author-link" href="https://twitter.com/joshpeek">@joshpeek</a>
+            <a class="author-link" href="https://github.com/josh">@josh</a>
           </div>
         </div>
       </section>