Fix links in home page introductory text.
Fix links in home page introductory text.

robinwhittleton/whitehall,YOTOV-LIMITED/whitehall,ggoral/whitehall,hotvulcan/whitehall,ggoral/whitehall,hotvulcan/whitehall,askl56/whitehall,YOTOV-LIMITED/whitehall,robinwhittleton/whitehall,YOTOV-LIMITED/whitehall,robinwhittleton/whitehall,robinwhittleton/whitehall,ggoral/whitehall,alphagov/whitehall,hotvulcan/whitehall,askl56/whitehall,alphagov/whitehall,askl56/whitehall,askl56/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall,alphagov/whitehall,hotvulcan/whitehall,alphagov/whitehall