✨ feat(shortcodes): support body admonitions

[welpo]

Summary

Add support for using admonition shortcodes with a content body:

{% admonition(type="danger", icon="tip", title="An important tip") %}
Stay hydrated~

This method is particularly useful for longer content or multiple paragraphs.
{% end %}

This allows for more natural writing of longer content blocks while maintaining backward compatibility with the existing parameter-based syntax.

Changes

• Added support for body content in admonition shortcodes
• Updated documentation in all languages to show both usage methods
• Maintained backward compatibility with existing parameter-based syntax

Type of change

• Bug fix (fixes an issue without altering functionality)
• New feature (adds non-breaking functionality)
• Breaking change (alters existing functionality)
• UI/UX improvement (enhances user interface without altering functionality)
• Refactor (improves code quality without altering functionality)
• Documentation update
• Other (please describe below)

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Checklist

• I have verified the accessibility of my changes
• I have tested all possible scenarios for this change
• I have updated theme.toml with a sane default for the feature
• I have made corresponding changes to the documentation:
  • Updated config.toml comments
  • Updated theme.toml comments
  • Updated "Mastering tabi" post in English
  • Updated "Mastering tabi" post in Spanish
  • Updated "Mastering tabi" post in Catalan

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