Create custom tags allowing to be used in Markdown pages to improve style

[benjagm]

As of now, there are some tags defined in this component to allow custom tags to be used in Markdown as follows:

<Infobox label="Draft-specific info">
In Draft 4, a `$schema` value of
`http://json-schema.org/schema#` referred to the latest version
of JSON Schema. This usage has since been deprecated and the use
of specific version URIs is required.
</Infobox>

Example of usage: https://github.com/json-schema-org/website/blob/main/pages/understanding-json-schema/basics.md

Currently we have:

• summary
• blockquote
• details
• infobox
• Star
• StarInline
• Bigquote

It will be nice to have 3 new declarations for:

• Tip
• Warning
• Danger

Additional information:

• For the 3 new tags well use the sae approach than Infobox, changing the color and adding SVG icons as per this example: https://chirpy.cotes.page/posts/text-and-typography/#prompts
• The existing Infobox element will be modified to add the icon to make everything consistent.

Once this is done it will be great to update the contributing to explain all the allowed custom tags.

[Ali7040]

@benjagm Hi there!, I would like to work on that issue.

[benjagm]

FYI @divyaxdv is working on this issue in this PR #314