…pdates

- Remove support for WebPageTest, BigQuery, and snippet
- Remove deprecated migration documentation (MIGRATION.md, V2_PROGRESS.md, etc.)
- Add validation for meta elements appearing after title
- Add validation for font preload missing crossorigin attribute
- Update documentation for assessment mode and rules
- Update dependencies and build configuration
- Improve adapter and analyzer logic

…r AdapterInterface to a class.

…e browser adapter to extend `AdapterInterface`.

…stantiation and explicit validation

…eractive grouping, improved styled output, and comprehensive HTML escaping while removing the console reminder UI.

… output in docs and refine sorted head visualization.

…ate files and add Vitest tests