Add 11 source-only StyleSeed skills covering UI setup, page and pattern
scaffolding, token management, accessibility review, UX flows,
microcopy, audits, and feedback states.
Also credit bitjaru/styleseed in the community contributors list so
source attribution matches the new source_repo metadata.
Fixes#478
Co-authored-by: sickn33 <sickn33@users.noreply.github.com>
