Bring back #4128

[cte]

Description

Add the website app back to the monorepo.

---

Important

Reintroduces the website app into the monorepo with new components, database schema, utilities, and configurations.

• Components:
  • Adds Features, Testimonials, InstallSection, WhatsNewButton, and ScrollButton components in src/components/homepage.
  • Adds Button, Chart, Modal, Table, and ScrollButton components in src/components/ui.
  • Adds PostHogProvider and Providers in src/components/providers.
• Database:
  • Defines runs, tasks, and taskMetrics tables in schema.ts.
  • Adds queries for runs, tasks, and taskMetrics in queries directory.
  • Includes Drizzle ORM migration files in drizzle directory.
• Utilities:
  • Adds formatting utilities in src/lib for currency, duration, score, and tokens.
  • Adds use-open-router-models hook in src/lib/hooks.
  • Adds get-language-scores server function in src/lib/server.
• Configuration:
  • Configures Tailwind CSS in tailwind.config.ts.
  • Updates package.json with new dependencies for the website app.

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[ellipsis-dev]

Typo: 'exluded' should be 'excluded' in the note regarding the scatter plot.

Suggested change

	(Note: Very expensive models are exluded from the scatter plot.)
	(Note: Very expensive models are excluded from the scatter plot.)