docs: add complete Nextra documentation site with i18n and deep-dive sub-pages (#2)

chore(app): update dependencies and layout

docs: add project README

Merge pull request #1 from smilewilson1999/feat/nextra

docs(zh-TW): add Traditional Chinese (Taiwan) documentation

docs(zh-CN): add Simplified Chinese documentation

docs(en): add English architecture documentation

feat(app): add Nextra docs framework with i18n support

chore: add .gitignore

chore: ignore .DS_Store

v2.1.88 source code