Remove LocaleNumber and RelativeTime until they are real components #66

LocaleNumber and RelativeTime are thin wrappers over Intl.NumberFormat / Intl.RelativeTimeFormat that render bare text. They have no UI, so they don't belong in a UI component library next to the redesigned components.

Scope

• Remove both components, their exports, registry items, tests and docs pages (the Formatters section).
• Breaking for npm consumers importing them; ship with the 2.0.0 redesign release.

They can come back as proper components (for example a relative time with an absolute-date tooltip, or an animated locale-aware counter) in a new proposal.