Add World-Class Web Design OS

[Lrinvl1203]

Adds World-Class Web Design OS to the Skills / Collections section.

Why it fits:

• direct Codex CLI integration through a one-line installer into the global skills directory
• 17 routed SKILL.md bundles for discovery, art direction, implementation, critique, accessibility, and browser QA
• active public repository with validation, routing evals, Playwright release gates, and MIT licensing
• follows the requested one-sentence description and flat-square star badge format

I maintain the linked project and am happy to adjust the category or wording.