Enable syntax highlighting in docs-app code snippets

[Copilot]

The kolay plugin was missing the rehypeShiki configuration, so code snippets in the docs-app rendered without syntax highlighting despite @shikijs/rehype and shiki already being installed and listed in optimizeDeps.include.

Changes

• docs-app/vite.config.js: Import rehypeShiki and wire it into kolay's rehypePlugins with github-light/github-dark themes and light-dark() adaptive coloring:

import rehypeShiki from '@shikijs/rehype';

kolay({
  packages: ['@universal-ember/table'],
  rehypePlugins: [
    [
      rehypeShiki,
      {
        themes: {
          light: 'github-light',
          dark: 'github-dark',
        },
        defaultColor: 'light-dark()',
      },
    ],
  ],
}),

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[github-actions]

Project	Preview URL
Docs	https://11e2b282.ue-table.pages.dev

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