docs: explain rktlet design and remove outdated parts

kubernetes-retired / rktlet

[EOL] The rkt implementation of the Kubernetes Container Runtime Interface

Apache License 2.0

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Closed iaguis closed 6 years ago

iaguis commented 6 years ago

rktlet is not meant to remain in-process with Kubelet.
the part about developing it as a separare repository is common practice and doesn't require explanation
soften down the statement about using rkt as a library instead of executing the binary

Also, add architecture diagram.

Fixes #157