[FEATURE] Support GitHub like Markdown Admonitions

[linawolf]

See https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#alerts

Resolves https://github.com/phpDocumentor/guides/issues/1089

[linawolf]

I moved extended the classes in the rst. Duh, completely forgot about the node renderer

[phpdoc-bot]

💚 All backports created successfully

Status	Branch	Result
✅	1.x

Note: Successful backport PRs will be merged automatically after passing CI.

Questions ?

Please refer to the Backport tool documentation and see the Github Action logs for details