Fix docs site: kolay src shorthand is not implemented, must use groups

[Copilot]

The kolay vite plugin's top-level src option is documented as a shorthand but is never consumed by combinedPlugins() — only options.groups is passed through to setup(). As a result, the docs directory was silently ignored and every doc page returned "Page not found".

Changes

• docs-app/vite.config.js: Replace the ignored src shorthand with the groups array that kolay actually reads. Use name: '' so pages resolve at root-level URLs (e.g. /1-get-started/index.md), matching existing links. import.meta.resolve() produces a file:// URL that kolay's internal normalizePath() converts to an absolute path for correct Vite /@fs imports.

// Before — `src` is silently ignored by combined.js
kolay({
  src: import.meta.resolve('./public/docs', import.meta.url),
  packages: ['@universal-ember/table'],
}),

// After — kolay actually reads options.groups
kolay({
  groups: [{ name: '', src: import.meta.resolve('./public/docs') }],
  packages: ['@universal-ember/table'],
}),

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