GitHub special Markdown blocks aren't rendered in README section

[kbdharun]

Current Behavior

Currently, crates display the blockquote as it is in Markdown.

Expected Behavior

GitHub supports custom rendering for descriptions enclosed inside blockquote starting with [!NOTE], [!TIP], [!IMPORTANT], [!WARNING], [!CAUTION] and this is widely used by many projects.

Syntax:

> [!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.

Which looks like this once rendered:

These descriptions in Crates README can be rendered similarly to how it is shown in GitHub.

Check out https://github.com/orgs/community/discussions/16925 for more information.

Steps To Reproduce

1. Go to a Crate using this kind of syntax in the README file i.e. https://crates.io/crates/tlrc.
2. Navigate to the note or relevant section.

Environment

• Browser: Google Chrome Version 124.0.6367.60 (Official Build) (64-bit)
• OS: Fedora Linux 39 (Workstation Edition)

Anything else?

No response