Build an App in Pure JS - Link Corrected

[rahuldotbiz]

Corrected the link for the tutorial.

Description

The tutorial by "CodingSmartWay" on Build an App in Pure JS was giving the 404 link, so just corrected it.

Motivation and Context

• Changed 404 to correct link

Types of changes

• [X] Content Update (change which fixes an issue or updates an already existing submission)
• [ ] New Article (change which adds functionality)
• [ ] Documentation change

Checklist:

• [X] My code follows the code style of this project.
• [X] I have updated the documentation accordingly.
• [X] I have read the CONTRIBUTING document.
• [X] I have made checks to ensure URLs and other resources are valid