chores(docs): Use latest as alias and workflow_dispatch to set new version as latest

[ROunofF]

What does it do ?

• This use "latest" as an alias instead of a manually deployed version (like now).

• Note The current latest version will need to be deleted from the branch gh-pages with mike delete latest --push by someone with write access or this workflow will fail with an error similar to this : error: alias 'latest' already specified as a version

Motivation

Prevent to have to maintain a latest and an automated version based on tag ( today : v0.20.0 ) but still aligns with kubernetes. Avoids user confusion see #6165

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[k8s-ci-robot]

Hi @ROunofF. Thanks for your PR.

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