Most of the contents of docs/ has moved to kubernetes.github.io.
Development of the docs and accompanying files has continued there, making
the copies in this repo stale. I've removed everything but the .md files
which remain to redirect old links. The .yaml config files in the docs
were used by some tests, these have been moved to test/fixtures/doc-yaml,
and can remain there to be used by tests or other purposes.
Move namespace.md and examples dir from docs/user-guide
to docs/admin.
Assumption is that creating and deleting namespaces is an "admin"
task.
Add a mostly new user-guide to namespaces that gives more advice
on when to use namespaces, and how to work within them,
but not how to create/delete them. It is more succinct than
before.
