Support Github Style Alerts

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Support GFM Alerts like this.

Note

Useful information that users should know, even when skimming content.

Tip

Helpful advice for doing things better or more easily.

Important

Key information users need to know to achieve their goal.

Warning

Urgent info that needs immediate user attention to avoid problems.

Caution

Advises about risks or negative outcomes of certain actions.

Describe the solution you'd like
There's one rehype plugin rehype-github-alerts, but doesn't work with this repo.

Describe alternatives you've considered

1. DIY: Crafting Custom flavored Markdown for Svelte with mdsvex, or
2. Waiting for MDsveX's update.