[FEAT] Add support for GFM Alerts

[DerGoogler]

Could you add support for GFM Alerts?

Ref: https://github.com/orgs/community/discussions/16925

[quantizor]

How would you expect it to be implemented, putting the alert type in an <em> at the top of the <blockquote> or something? The library is intentionally un-opinionated about styles.

[quantizor]

With the new v7.4 renderRule option you can implement this yourself if desired by inspecting node.children for an appropriate first text child.

[DerGoogler]

This option is awesome 👍

[robertotcestari]

Hello @DerGoogler did you implement this? Do you have an example code?

thanks!

[DerGoogler]

@quantizor To add alerts like GitHub... isn't posible here ....

it returns something like this here:

[
  {
    "text": "[",
    "type": "27"
  },
  {
    "text": "!CAUTION",
    "type": "27"
  },
  {
    "text": "]\nNegative ",
    "type": "27"
  },
  {
    "text": "potential",
    "type": "5"
  },
  {
    "text": " consequences of an action.\nNegative ",
    "type": "27"
  },
  {
    "text": "potential",
    "type": "5"
  },
  {
    "text": " consequences of an action.",
    "type": "27"
  }
]

how I should parse such things?????

> [!CAUTION]
> Negative `potential` consequences of an action.
> Negative `potential` consequences of an action.

Caution

Negative potential consequences of an action.
Negative potential consequences of an action.