Use describe() to create accessible canvas descriptions in inline documentation

[lm-n]

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How would this new feature help increase access to p5.js?

This change from using @alt to using describe() in inline documentation will help model best practices for making p5.js sketches accessible to screen reader users. While @alt creates an extra <span> element after the canvas with the canvas description, describe() follows best accessibility practices (https://developer.mozilla.org/en-US/docs/Web/HTML/Element/canvas) by making the description a fallback text or sub DOM of the <canvas> html element.

Most appropriate sub-area of p5.js?

• [x] Accessibility (Web Accessibility)
• [ ] Build tools and processes
• [ ] Color
• [ ] Core/Environment/Rendering
• [ ] Data
• [ ] DOM
• [ ] Events
• [ ] Friendly error system
• [ ] Image
• [ ] IO (Input/Output)
• [ ] Localization
• [ ] Math
• [ ] Unit Testing
• [ ] Typography
• [ ] Utilities
• [ ] WebGL
• [ ] Other (specify if possible)

Feature enhancement details:

• [x] Update EN Contributor Docs Update documentation:
• [ ] Color Creating and Reading examples
• [x] Color Setting examples
• [x] Shape 2D primitives examples
• [ ] Shape Attributes examples
• [ ] Shape Curves examples
• [ ] Shape Vertex examples
• [ ] Shape 3D primitives examples
• [ ] Shape 3D models examples
• [ ] Constants examples
• [ ] Environment examples
• [ ] Structure examples
• [ ] DOM examples
• [ ] Rendering examples
• [ ] Foundation examples
• [ ] Transform examples
• [ ] Data Local Storage examples
• [ ] Data Dictionary examples
• [ ] Data Array Function examples
• [ ] Data Conversion examples
• [ ] Data String Functions examples
• [ ] Events Acceleration examples
• [ ] Events Keyboard examples
• [ ] Events Mouse examples
• [ ] Events Touch examples
• [ ] Image examples
• [ ] Image Loading and displaying pixels examples
• [ ] IO (Input) examples
• [ ] IO (Output) examples
• [ ] IO Table examples
• [ ] IO Time and Date examples
• [ ] Math Calculation examples
• [ ] Math Vector examples
• [ ] Math Noise examples
• [ ] Math Random examples
• [ ] Math Trigonometry examples
• [ ] Typography Attributes examples
• [ ] Typography Loading and Display examples
• [ ] Lights Camera - Interaction examples
• [ ] Lights Camera - Lights examples
• [ ] Lights Camera - Material examples
• [ ] Lights Camera - Camera examples