Add Vysmo Transitions to Transition Effect section

[ThomasDolso]

Adds Vysmo Transitions to the Transition Effect section.

• What it is: A WebGL 2 transition library with 60 built-in transitions (crossfade, page curl, glass shatter, ink diffuse, paint bleed, and more), plus a defineTransition API for custom GLSL. Open source, MIT licensed, zero dependencies.
• Why it fits: The Transition Effect section currently has mostly CSS-based slide/page transitions. Vysmo adds the WebGL angle — mesh and multi-pass shaders that aren't possible with CSS or pure fragment shaders.
• Differentiators: Tree-shakable per transition, ~5 KB gzipped, framework-agnostic (works with React, Vue, vanilla — matches your "not limited to any framework" criteria), idempotent render() enabling both timeline-driven and scroll-driven use.
• Repo: https://github.com/vysmodev/vysmo
• Homepage & live catalog: https://vysmo.com/transitions