templates:home: fix wiki url, mention freenode

tracker/templates/home.html

@@ -31,10 +31,11 @@ <h2>Vulnerabilities in Upstream Packages</h3>
     Our <a href="https://security.archlinux.org/issues/">CVE tracker</a> can help you
     review the vulnerabilities that affect the packages we provide. If you
     think a CVE that affects a package is not listed in there, do not hesitate
-    to reach out to us in irc on <tt>#archlinux-security</tt>.
+    to reach out to us in irc on <tt>#archlinux-security</tt> in
+    <a href="https://freenode.net">freenode</a>.
 
     <h2>Securing your Arch Linux installation</h3>
 
     Consider checking this 
-    <a href="https://wiki.archlinux.org/security/">Wiki page for more information</a>
+    <a href="https://wiki.archlinux.org/index.php/Security">Wiki page for more information</a>
 {%- endblock %}