Remove NVM/Node/FDE/dnsmasq from the README.md
Remove NVM/Node/FDE/dnsmasq from the README.md

I removed some things from the default install as they are not relevant to how
we use a VM for development. This commit removes them from the README as well 
to avoid confusion.
alphagov/gds-boxen,alphagov/gds-boxen,alphagov/gds-boxen