* Docs: update CONTRIBUTING.md

* Docs: clean up outdated roadmap and point to github issues instead

* Docs: update note on kubelet_cgroup_driver

* Docs: update kata containers docs with note about cgroup driver

* Docs: note about CI specific overrides

tests/scripts/ansible-lint.sh was written on the doc, but there was
not such file actually. We can use ansible-lint command to check
ansible yml files without any options.
This updates to use the command.