- Replaced LICENSE.md with copyright.md to reflect the CC-BY license for SRD 5.2.1 content.
- Added rules-glossary.md, species/README.md, species/dragonborn.md, srd/README.md, and srd/backgrounds.md.
- Updated README files and SUMMARY.md to reference new SRD material and structure.
- Modified templates for Character, Species, and Spell to align with new content organization.
