Update Note syntax

[sinsukehlab]

An option to highlight a "Note" and "Warning" is updated.
I will open PRs to apply this change to the courses.

See: https://github.com/orgs/community/discussions/16925#discussioncomment-6506860

[sinsukehlab]

PRs

• Note introduction-to-github#450

[sinsukehlab]

comments
skills/introduction-to-github#450 (comment)

[sinsukehlab]

Recent update has just broken everything. 😬
I will close this PR unless the feature is restored.

Update - 14 November 2023

• Add support for [!TIP] and [!CAUTION].
• Add support for alerts in Markdown files on GitHub Mobile apps. (pending a mobile app update)
• Add support for various Markdown extensions such as Math rendering, relative links, task lists, animated image player and footnotes.
• Prevent alerts from being nested within other elements.
• The initial syntax using e.g. **Note** isn't supported any longer.

[sinsukehlab]

😕
https://github.com/orgs/community/discussions/16925#discussioncomment-7575575