Contented Plugin Directives

[fuxingloh]

What would you like to be added:

Contented is a powerful Markdown-based authoring workflow, but it currently lacks the ability to integrate custom content rendering easily. Additionally, it would be beneficial to have a built-in feature to pull images from a Content Delivery Network (CDN) like GitHub assets to optimize loading times and improve the overall user experience.

I propose a new feature called "Contented Plugin Directives" that allows developers to create and use a plugin-like system to render lightweight content, enhancing the Markdown content in a more interactive and visually appealing way.

Example below.

```[github-snippet]
https://github.com/BirthdayResearch/contented/blob/04e05562b4df341aa3bf9862fb2716e55a6c18d0/packages/contented-pipeline-md/src/MarkdownPipeline.ts#L33-L37
```

[github-actions]

@fuxingloh: Thanks for opening an issue, it is currently awaiting triage.

The triage/accepted label can be added by foundation members by writing /triage accepted in a comment.

Details

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[github-actions]

@fuxingloh: There are no 'area' labels on this issue. Adding an appropriate label will greatly expedite the process for us. You can add as many area as you see fit. If you are unsure what to do you can ignore this!

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Details

I am a bot created to help the BirthdayResearch developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.