feat: add accTitle/accDescr to class diagram in WebGL architecture doc

[coseeian]

Summary

Adds accessibility tags (accTitle and accDescr) to the mermaid class diagram in the WebGL architecture documentation.

Motivation

In response to discussion in #168 (comment): Mermaid.js supports embedding accessibility metadata directly into generated SVG diagrams. This improves the experience for users with screen readers and other assistive technologies by providing a concise title and detailed description of the diagram's structure.

References

• Mermaid.js Accessibility Documentation

Testing

• Verified the mermaid diagram renders correctly for sighted users (no visual changes).
• Confirmed title and desc tags are present in the generated SVG.

• Tested with screen reader (macOS VoiceOver) to ensure title and description are announced properly.

[davepagurek]

Thanks @coseeian! The contributor docs don't actually originate from this repo, they start from the p5.js repo here https://github.com/processing/p5.js/tree/main/contributor_docs so that both website visitors and contributors originating from GitHub find them. Could I get you to make these changes there? Then, the next time we run npm run build:contributor-docs it will pull those changes in.

[coseeian]

@davepagurek Got it, thanks! Closing this PR now. I’ve moved the changes over to p5.js: processing/p5.js#8373.