docs: add comprehensive wiki pages (EN/KR) with sidebar - Home: overview, features, installation, quick start, wiki links - JSONL Support: auto-detection, pretty-print, compact save, record nav - JSONPath Search: syntax, value filtering, smartcase, JSONL mode - Embedded JSON Editing: parsing conditions, stack, double encoding - Substitute: regex, custom delimiters, JSONPath 3 modes, auto-type - Diff Viewer: block optimization, color coding, sync, EJ diff - Keybindings: complete reference for all modes with implementation details - _Sidebar: bilingual navigation (EN/KR)