Fixes GitHub link

Author: zachleat

src/site/_includes/header.njk

@@ -49,7 +49,7 @@
           <a href="https://twitter.com/jamstackconf" target="_BLANK" rel="noopener"  class="flex items-center justify-center p-4 hover:text-pink-500">
             <svg role="img" aria-label="Twitter" focusable="false" width="34" height="28" class="fill-current"><use xlink:href="#logo-twitter"></use></svg>
           </a>
-          <a href="https://github.org/jamstack/jamstack.org" target="_BLANK" rel="noopener"  class="flex items-center justify-center p-4 hover:text-pink-500">
+          <a href="https://github.com/jamstack/jamstack.org" target="_BLANK" rel="noopener"  class="flex items-center justify-center p-4 hover:text-pink-500">
             <svg role="img" aria-label="GitHub" focusable="false" width="36" height="36" class="fill-current"><use xlink:href="#logo-github"></use></svg>
           </a>
         </div>