Added legal page set

Property	Value
description	Added the shipped legal-page set under the custom `legal` post type.

• Added Privacy Policy under the legal post type at /privacy-policy.
• Added Cookie Policy under the legal post type at /cookie-policy.
• Added Terms of Service under the legal post type at /terms-of-service.
• Added Accessibility Statement under the legal post type at /accessibility-statement.
• Added Disclaimer under the legal post type at /disclaimer.
• Shipped the baseline with the legal page routes already populated instead of leaving this content for later setup.