add docs first draft

docs/_sidebar.md

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+- Getting started
+  - [Quick start](quickstart.md)
+  - [Writing more pages](more-pages.md)
+  - [Custom navbar](custom-navbar.md)
+  - [Cover page](cover.md)
+
+- Customization
+  - [Configuration](configuration.md)
+  - [Themes](themes.md)
+  - [List of Plugins](plugins.md)
+  - [Write a Plugin](write-a-plugin.md)
+  - [Markdown configuration](markdown.md)
+  - [Language highlighting](language-highlight.md)
+
+- Guide
+  - [Deploy](deploy.md)
+  - [Helpers](helpers.md)
+  - [Vue compatibility](vue.md)
+  - [CDN](cdn.md)
+  - [Offline Mode(PWA)](pwa.md)
+  - [Server-client renderer(SSR)](ssr.md)
+
+- [Changelog](changelog.md)