[FEATURE]: add support for embedded notations (alerts)

[Falcion]

Since Dec 14 2023, GitHub supports embedded notations or "alerts" for Markdown. On GitHub, they are displayed with distinctive colors and icons to indicate the importance of the content.

https://github.blog/changelog/2023-12-14-new-markdown-extension-alerts-provide-distinctive-styling-for-significant-content/

Issue is, learn-preview doesn't support this alerts in any form possible.

UNITADE offers, within the code editor settings, the option to enable or disable
forced interpretation of the `Ctrl+V` combination as a paste action: by default,
this setting is disabled, as it is unclear which version the user is running.

> [!Important]  
> Due to the "makeshift" nature of this solution, the capabilities of these command
> actions are limited: visually (there are no effects after selection, etc.) and
> functionally (the cursor remains at its original position before the paste).

Looks like: