Update README for 22.02 release

Update README for 22.01 release

Update README for 21.12 release

Update versions in Dockerfiles for 21.11 release

Update README for 21.10 release

Update README for 21.09 release

Update README for 21.08 release (triton-inference-server#3273)

Update README for 21.07 release

Update README and versions for 21.06 release (triton-inference-server…

…#3035)

Remove mention of custom backend (triton-inference-server#2905)