Remove mention of Groff - it is not needed any more

Author: gnoack

index.html

@@ -128,8 +128,7 @@ <h2>Get started today!</h2>
 <p>What you need:</p>
 
 <ul>
-  <li>A UNIX&trade; or Linux&trade; workstation with <a href="https://www.gnu.org/software/groff/">GNU roff</a>.<br> Groff is usually already installed on most Linux distributions.</li>
-  <li>Imagemagick's <tt>convert</tt>, if you want profile pictures.</li>
+  <li>A UNIX&trade; or Linux&trade; workstation</li>
   <li>The <i>Go programming language</i>, to install <i>Mailprint</i> from source.</li>
 </ul>