Adds CrossPromoteSectionConfig to landing page configuration, allowing repositories to showcase related projects/products. Section includes customizable headline and subheadline.
Adds LabelCrossPromote to NavigationConfig for translatable section heading. All templates default to "Related Offerings" with template-specific variations (e.g., "Related Offerings" for architecture-deep-dive).
Updates all 9 landing page templates to render cross-promote section when enabled. Adds locale strings for cross-promote UI across all 30 supported languages.
Useful for organizations promoting a product family or related open-source projects from a single landing page.