change the filename of the debian repository key on the website

i2p2www/pages/downloads/debian.html

@@ -108,10 +108,10 @@ For Testing or Unstable:<br />
 </pre>
   </li>
 
-  <li>{% trans repokey=url_for('static', filename='debian-repo.pub') -%}
+  <li>{% trans repokey=url_for('static', filename='i2p-debian-repo.key.asc') -%}
 Download <a href="{{ repokey }}">the  key used to sign the repository</a> and add it to apt:
 {%- endtrans %}<br />
-&nbsp;&nbsp;&nbsp; <code>apt-key add debian-repo.pub</code>
+&nbsp;&nbsp;&nbsp; <code>apt-key add i2p-debian-repo.key.asc</code>
   </li>
 
   <li>