fix: align GitHub syntax mapping with admonition types

[JoeyC-Dev]

Type of change

• Bug fix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please describe):

Checklist

• I have read the CONTRIBUTING document.
• I have checked to ensure that this Pull Request is not for personal changes.
• I have performed a self-review of my own code.
• My changes generate no new warnings.

Related Issue

Close: #742

Changes

• Remap in remark plugin config

How To Test

Add below to the test page:

> [!IMPORTANT]
> The GitHub syntax is also supported.

> [!CAUTION]
> The GitHub syntax is also supported.

> [!WARNING]
> The GitHub syntax is also supported.

> [!NOTE]
> The GitHub syntax is also supported.

> [!TIP]
> The GitHub syntax is also supported.

Screenshots (if applicable)

Additional Notes

Same fix but different approach: #645

[vercel]

@JoeyC-Dev is attempting to deploy a commit to the zephyirdgmailcom's projects Team on Vercel.

A member of the Team first needs to authorize it.