Add Athena Personal Academic Page to React templates

[AaronZ345]

Adds Athena to the end of the React starter-template list. The description is 19 words and links to the repository rather than the demo.

Checklist

• Title describes the submitted item.
• Added to the React starter-template category.
• Description is one sentence with fewer than 24 words.
• Description contains no extra links or parentheses.
• Tool names use proper case and omit versions.
• Added at the end of the list.

Starter Templates

• Works with Vite 2.x and onward.
• Documentation is in English.
• README covers setup and included sections.
• README includes a live demo and static preview.
• Repository is more than 30 days old.
• Focuses specifically on publication-first academic homepages.