Fix configFile path in sass-customization guide

[Timbuktu1982]

It does not work with the prefix @ or ~ used today. If you omit the prefix, it works without errors.

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[AndreyYolkin]

Thanks for spotting this, and apologies for the slow turnaround! Closing because the change isn't quite right and the target has moved:

1. The docs were reorganized — sass-customization.md is now guide/styling/sass.md, which no longer contains the configFile: '@/assets/css/components.scss' line this patch edits.
2. A leading / would actually break resolution. The module resolves styles.configFile like this: a non-absolute path is resolved against each layer's srcDir, otherwise it's passed to Nuxt's resolvePath. A leading-slash path is absolute (filesystem root), so it wouldn't resolve to your project. The original @/assets/... works (Nuxt resolves the @ alias), and the canonical form in the current docs is simply srcDir-relative — configFile: 'assets/settings.scss' (see guide/styling/common-setup.md and guide/styling/caching.md).

We're also fixing a leftover leading-slash example in the SSR guide separately. Thanks again for the report! 🙏