This pull request updates the pricing documentation and related CSS to introduce a new "Builder" tier, clarify plan features, and improve transparency around pricing and plan differences. Key changes include adding the Builder plan, updating plan descriptions and feature tables, expanding the FAQ, and adjusting the pricing grid layout.

Pricing plan updates:

• Added a new "Builder" plan between Launch and Data Access, including details on features, pricing, and intended use case.
• Updated all plan descriptions, feature lists, and availability/SLA language for clarity and to reflect current offerings (e.g., fair-use limits, scoped processor development, and deployment-scoped pricing for BYOC Managed). [1] [2] [3]
• Revised the feature comparison table to include the Builder tier and updated feature/limit descriptions across all plans.

Documentation improvements:

• Expanded the FAQ section to explain the differences between Builder and Data Access, define "fair-use limits," and clarify how custom processor scope is determined.
• Updated upgrade path guidance and clarified onboarding and deployment processes for each plan. [1] [2]

UI adjustments:

• Changed the CSS grid for pricing tiers from four to three columns to better fit the updated plans. (src/css/custom.css)