External links should use the external link icons, by default

[fs250044]

Is your feature request related to a problem? Please describe.
When viewing a MD text hyperlink, users have no way to know if the link will open an external browser window or not.

Describe the solution you'd like
The open in new icon should be added to links that open a new window (that is, that link to something outside of the current domain).

Describe alternatives you've considered
The image/icon could manually be added to every link, but that (1) becomes a maintenance nightmare and (2) makes it impossible to change out iconsets.

Additional context
Would be nice to be able to:

1. Define the exact icon to use (e.g., https://fonts.google.com/icons?icon.query=open+in+new)
2. Define the exact "home" domain.
3. Be able to also add (or not) the icon on-demand.

[owilliams320]

🎉 This issue has been resolved in version 8.3.1 🎉

The release is available on:

• v8.3.1
• GitHub release

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