update docker and singularity links

Author: Jakub Kaczmarzyk

doc/links_names.txt

@@ -105,8 +105,8 @@
 .. _mingw: http://www.mingw.org
 .. _macports: http://www.macports.org/
 .. _Vagrant: http://www.vagrantup.com/
-.. _Docker: http://www.docker.io/
-.. _Singularity: http://singularity.lbl.gov/
+.. _Docker: http://www.docker.com/
+.. _Singularity: https://www.sylabs.io/singularity/
 .. _Virtualbox: https://www.virtualbox.org/
 
 .. Functional imaging labs