Remove obsolete 'bootcamp' project.

It was a nice idea to recruit more maintainers but we never found the
time to do it properly...

I am still interested in any ideas to make it easier to start
contributing!

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Merge pull request #5459 from shykes/remove-bootcamp

Remove obsolete 'bootcamp' project.