Remove DOM Enlightenment from the additional resources for the DOM Manipulation and Events lesson

[bizarf]

Because

The original link no longer works as the domain has expired. There is a backup available on web archive, but this resource may no longer be required since there's plenty of other resources listed in the additional resources section of that lesson.

This PR

• Removes DOM Enlightenment from the additional resources list for the DOM Manipulation and Events lesson

Issue

Closes #28996

Additional Information

Pull Request Requirements

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• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
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