Jean BEZIAUD

**Is your feature request related to a problem? Please describe.** Add support for Docusaurus admonitions See https://docusaurus.io/docs/next/markdown-features/admonitions

[BUG] 6.0.1 MedialElement doesn't display / load embedded source

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### Is there an existing issue for this? - [x] I have searched the existing issues ### Did you read the "Reporting a bug" section on Contributing file? - [x]...