docs: fix outdated skill names + broken install paths (issue #1)
The wiki still referenced the old /ui-* and /ux-* slash commands (renamed
to /ss-* long ago) and a seed/ source dir that no longer exists (now
engine/). Anyone following Getting-Started or Claude-Code-Skills hit
commands and paths that don't exist.
- Claude-Code-Skills: rewrite for the real 14 /ss-* skills (was '10 /ui-*')
- Getting-Started: correct engine/ install paths, beginner-friendly flow,
troubleshooting; recommend /ss-setup
- Home + Using-with-awesome-design-md: fix counts, seed/->engine/ links
- Add a migration note so old bookmarks still make sense
Reported by @binaryitsolutions.