Add support for markdown links.

[skilldeliver]

This PR introduces markdown link detection and rendering. To achieve this, the regex has been updated, and an additional property, link, has been added to the tokens. If it's a URL, the URL remains the same, with the actual text rendered. However, for markdown, we aim to have a named link where the text differs from the link.

Screenshot examples:

Here is the raw text content

Here is the rendered

Special thanks to Darius for recognizing the need for named links.