fix urls

index.html

@@ -46,8 +46,8 @@
 <ul>
 <li>
 <a href="http://postfixadmin.sf.net">http://postfixadmin.sf.net</a> - the current homepage for the project</li>
-<li><a href="/DOCUMENTS/POSTFIXADMIN.txt">What is it?</a></li>
-<li><a href="/INSTALL.TXT">Installation instructions</a></li>
+<li><a href="https://raw.githubusercontent.com/postfixadmin/postfixadmin/master/DOCUMENTS/POSTFIXADMIN.txt">What is it?</a></li>
+<li><a href="https://raw.githubusercontent.com/postfixadmin/postfixadmin/master/INSTALL.TXT">Installation instructions</a></li>
 <li><a href="http://sourceforge.net/apps/mediawiki/postfixadmin">Wiki</a></li>
 <li><a href="https://sourceforge.net/p/postfixadmin/discussion/676076">Mailing list</a></li>
 <li>IRC channel (#postfixadmin on irc.freenode.net).</li>