[Actions][Doc] Clean up Actions README#91789

Merged

ymao1 merged 11 commits intoelastic:masterfrom ymao1:actions/readme

Feb 24, 2021

+204-575

Commits on Feb 18, 2021

Commits on Feb 19, 2021

Apply suggestions from code review

ymao1
and
gchaps
authored

Commits on Feb 20, 2021

PR fixes
ymao1
committed

Commits on Feb 22, 2021

Merge branch 'master' into actions/readme
kibanamachine
authored

Commits on Feb 23, 2021

Update x-pack/plugins/actions/README.md

ymao1
and
gchaps
authored