Remove all launcher files

This guts this repository - that is the plan. Aim is for vCloud Tools to be a meta-gem that pulls in the other gems (need to move utils out before that happens).
Update README

- Change VCloud to vCloud
- Update some links, including the link to the published launcher gem
- A few other tidy-ups
No need for jenkins_integration_tests

There is now no Rakefile and no integration tests so no need for the jenkins_integration_tests script. I have also removed the integration test jobs in Jenkins.

This also removes `bundle exec rake` from `jenkins.sh` for similar reasons. However, the the script will be required when the step is made to meta-gem so no need to remove it here.
Merge pull request #179 from alphagov/remove-launcher

[#62889580] Remove launcher