Add support for GitHub-style alert blocks -- `> [!TIP]` and its siblings

Is your feature request related to a problem? Please describe.

In GitHub you can have

> [!TIP]
>
> Some tip

Which will render

[!TIP]

Some tip

But now it is not gonna work as you can see here: https://dev.to/kasir-barati/setup-infra-deploy-the-app-verify-and-tear-it-all-down-12ik

Describe the solution you'd like

Please render and treat them differently. Similar to what GitHub has: https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#alerts

Describe alternatives you've considered

Harder and less appealing but nonetheless an option:

> **Tip**
>
> Some tip

Additional context

N/A