control: Update URLs and priority

debian/control

 Source: icingaweb2
 Section: admin
-Priority: extra
+Priority: optional
 Maintainer: Debian Nagios Maintainer Group <pkg-nagios-devel@lists.alioth.debian.org>
 Uploaders:
  Markus Frosch <lazyfrosch@debian.org>
@@ -11,9 +11,9 @@ Build-Depends:
 # php-htmlpurifier (>= 4.3),
  node-uglify (>= 2) | yui-compressor, node-source-map | yui-compressor
 Standards-Version: 3.9.8
-Homepage: https://www.icinga.org
-Vcs-Browser: https://anonscm.debian.org/cgit/pkg-nagios/pkg-icingaweb2.git
-Vcs-Git: https://anonscm.debian.org/git/pkg-nagios/pkg-icingaweb2.git
+Homepage: https://www.icinga.com
+Vcs-Browser: https://git.icinga.com/packaging/deb-icingaweb2
+Vcs-Git: https://git.icinga.com/packaging/deb-icingaweb2.git
 
 Package: icingaweb2
 Architecture: all