Broken link to contribution docs in the README.md

[ravixalgorithm]

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

No response

Web browser and version

No response

Operating system

No response

Steps to reproduce this

There are broken links in this file
Readme File to Contribution docs.

The link should open this file but open this page and get a 404 page instead.

[welcome]

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