更新首页二维码，优化部分页面显示，更新 readme

src/app/(home)/docs/page.tsx

@@ -1,7 +1,3 @@
-import Link from 'next/link'
-import {Card, CardContent, CardDescription, CardHeader, CardTitle} from '@/components/ui/card'
-import {BookOpen, Lightbulb, Smartphone, Zap, HelpCircle, FileText, Settings, TrendingUp} from 'lucide-react'
-
 export default function DocsIndexPage() {
   return (
     <div></div>

src/app/(home)/docs/sidebar.tsx

@@ -105,7 +105,7 @@ export default function Sidebar({collapsed = false}: Props) {
     }))
   }
 
-  const getItemHref = (key: string) => `/help/${key}`
+  const getItemHref = (key: string) => `/docs/${key}`
 
   return (
     <aside