DITA Bootstrap v6

[jason-fox]

The v6 branch updates the Bootswatch-based PDF themes to implement the new Bootstrap 6 color system tokens.

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1. Universal Color Token Migration (Light/Dark $\rightarrow$ Accent/Inverse)

Across all 35 Bootswatch PDF themes (including Cosmo, Cyborg, Darkly, Flatly, Slate, Superhero, etc.), the variable configuration files were updated:

• Removed Variables: All references to light and dark color systems, including their subtle background, subtle text, table background, button, and badge styling variables.
• Added Variables: Equivalent theme-specific variables for the accent and inverse color systems.

For each theme, these variables are customized with distinct hex values that match the theme's visual branding. For example:

• In the Brite theme, the new accent color is mapped to pink (#f5a4c9) with customized text, button, table, and badge styles.
• In dark-mode themes (like Cyborg or Darkly), the inverse variable maps to the primary dark body color with inverted light values for readability.

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2. Component Value Alignments

All theme-specific components (buttons, badges, tables, alerts, and notes) now consume the updated accent and inverse mappings to ensure consistent PDF rendering when compiling documents with specific theme overrides.