Amend README.md for new subdomain.

References #4

README.md

-Program Specification & Verification Group Website
-==================================================
+Program Specification & Verification Group Website: http://psvg.doc.ic.ac.uk/
+=============================================================================
 
 [![Dependency Status](https://gemnasium.com/bd81b2aa11ff43417700f75dbd194221.svg)](https://gemnasium.com/6ba7afbbfda9adcba06f007cc565a29a)
 
-The source code for [this site](http://www-rr.doc.ic.ac.uk) is [hosted on the DoC GitLab server](https://gitlab.doc.ic.ac.uk/resource-reasoning/www-rw.doc.ic.ac.uk),
+The source code for [this site](http://psvg.doc.ic.ac.uk) is [hosted on the DoC GitLab server](https://gitlab.doc.ic.ac.uk/resource-reasoning/www-rw.doc.ic.ac.uk),
 you should have access to edit it if a member of the resource-reasoning group.
 
 Technical Detail