docs: add reasoning behind all repo rules
docs: add contributor onboarding expectations section
docs: document @import rules, assists subfolder, and CSS import section
docs: remove open-an-issue requirement, document PR template
docs: document case-insensitive unique author name rule
docs: document AUTHOR.md H1 heading requirement and display name usage
docs: redesign contributor guide, remove repetition
docs: add Quick Start section, AUTHOR.md template, and wiki footer
docs: add content policy with NSFW labeling requirement
docs: explain why external image hosts are blocked
docs: add image hosting requirements and new-theme command - All CSS url() references must point to raw.githubusercontent.com for this repo — external hosts blocked at PR validation - Documents new-theme interactive and non-interactive usage with note about replacing imgur placeholder URLs before submitting Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Update dev guide: AUTHOR.md, file rules, .\ prefix, folder-scoped doctor
Fix issue links to use absolute URLs
Wire issue page into wiki
Update install instructions to prefer raw URLs, remove issue tracker reference
Initial wiki: Home and Developer & Contributor Guide