docs: uniform AntV navbar's order and naming

gatsby-config.js

@@ -23,21 +23,21 @@ module.exports = {
       {
         slug: 'docs/manual/introduction',
         title: {
-          zh: '文档',
-          en: 'Docs',
+          zh: '使用文档',
+          en: 'Manual',
         },
       },
       {
         slug: 'docs/api/Graph',
         title: {
-          zh: 'API',
+          zh: 'API 文档',
           en: 'API',
         },
       },
       {
         slug: 'examples',
         title: {
-          zh: '图表演示',
+          zh: '图表示例',
           en: 'Examples',
         },
       },

package.json

@@ -125,4 +125,4 @@
     "webpack-cli": "^3.3.10",
     "worker-loader": "^2.0.0"
   }
-}
+}