Update article link in the Assignment section

[turgunovm]

The first link in the Assignment section is not working, so I changed it to a working link (medium.com)

Because

This PR

Issue

Closes #XXXXX

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum contributing guide
• 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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• If any lesson files are included in this PR, they follow the Layout Style Guide

[MaoShizhong]

On hold as webarchive was DDoSed, hence temporarily broken links: #28936 (comment)

[MaoShizhong]

Closing as webarchive is back up after the recent DDoS attack.
Also related to why we don't want to use the medium link for that article: #28951 (comment)