site: fix links

site/component/Home/Banner.jsx

@@ -25,7 +25,7 @@ export default class Banner extends React.Component {
             <p key="content">一个 UI 设计语言</p>
             <span className="line" key="line" />
             <div className="start-button clearfix">
-              <Link key="button" to="/spec">
+              <Link key="button" to="/docs/spec/introduce">
                 <Icon type="smile-circle" />开始探索
               </Link>
             </div>

site/component/Home/Page1.jsx

@@ -15,7 +15,7 @@ export default class Page1 extends React.Component {
             <h2 key="h2">最佳实践</h2>
             <p key="p" style={{ maxWidth: 310 }}>近一年的中后台设计实践，积累了大量的优秀案例。</p>
             <div key="button">
-              <Link to="/practice">
+              <Link to="/docs/practice/cases">
                 <Button type="primary" size="large">
                   了解更多
                   <Icon type="right" />

site/component/Home/Page2.jsx

@@ -14,7 +14,7 @@ export default class Page2 extends React.Component {
           <h2 key="h2">设计模式</h2>
           <p key="p" style={{ maxWidth: 260 }}>总结中后台设计中反复出现的问题，并提供相应的解决方案。</p>
           <div key="button">
-            <Link to="/pattern">
+            <Link to="/docs/pattern/navigation">
               <Button type="primary" size="large">
                 了解更多
                 <Icon type="right" />