[Website] Update link to Emacs mode repo

The original maintainer (mgyucht) transferred ownership to GitHub user
tminor.

Author: tminor

Diff for: doc/learning/tools.html

@@ -50,7 +50,7 @@ <h1 id="tooling">Tooling</h1>
               imported files and local variables.
             </li>
             <li>
-              An <a href="https://github.com/mgyucht/jsonnet-mode">Emacs mode</a> is also available.
+              An <a href="https://github.com/tminor/jsonnet-mode">Emacs mode</a> is also available.
             </li>
           </ul>
         </li>