Support alerts, highlighted block-quotes (GitHub-style) #80
Description
GitHub supports highlighting block-quotes, for example:
Note
Highlights information that users should take into account, even when skimming.
Tip
Optional information to help a user be more successful.
Important
Crucial information necessary for users to succeed.
Warning
Critical content demanding immediate user attention due to potential risks.
Caution
Negative potential consequences of an action.
It would be nice to render these properly.
See also wooorm/markdown-rs#168