Fix broken links in contributor_docs/fes_contribution_guide.md

[aleannab]

Most appropriate sub-area of p5.js?

• Accessibility
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Image
• IO
• Math
• Typography
• Utilities
• WebGL
• Build process
• Unit testing
• Internationalization
• Friendly errors
• Other (specify if possible)

p5.js version

v1.10.0 (latest)

Web browser and version

Firefox v130.0, though would affect all.

Operating system

Windows, though would affect all.

Steps to reproduce this

Steps:

1. Go to: https://github.com/processing/p5.js/blob/main/contributor_docs/fes_contribution_guide.md
2. Click on respective link (listed in table below).
3. Get a 404 error.

Solutions:

Replace listed broken link to the correct link. I looked through the repo and couldn't find a similar file path name.

Source link text:	Current link:	Suggested link:
Friendly Error performance test	https://github.com/processing/p5.js-website/tree/main/src/assets/learn/performance/code/friendly-error-system	???

[Ashutoshdikshit07]

Hi I would love to add the correct link. Can you assign this task to me ?