docs: update GA

Author: ulivz

packages/docs/docs/config/README.md

@@ -80,17 +80,6 @@ Specify the temporary directory for client.
 
 Specify the output directory for `vuepress build`. If a relative path is specified, it will be resolved based on `process.cwd()`.
 
-### ga
-
-- Type: `string`
-- Default: `undefined`
-
-Provide the Google Analytics ID to enable integration.
-
-::: tip
-Please be aware of [GDPR (2018 reform of EU data protection rules)](https://ec.europa.eu/commission/priorities/justice-and-fundamental-rights/data-protection/2018-reform-eu-data-protection-rules_en) and consider setting Google Analytics to [anonymize IPs](https://support.google.com/analytics/answer/2763052?hl=en) where appropriate and/or needed.
-:::
-
 ### locales
 
 - Type: `{ [path: string]: Object }`

packages/docs/docs/plugin/official/plugin-google-analytics.md

@@ -30,6 +30,10 @@ module.exports = {
 }
 ```
 
+::: tip
+Please be aware of [GDPR (2018 reform of EU data protection rules)](https://ec.europa.eu/commission/priorities/justice-and-fundamental-rights/data-protection/2018-reform-eu-data-protection-rules_en) and consider setting Google Analytics to [anonymize IPs](https://support.google.com/analytics/answer/2763052?hl=en) where appropriate and/or needed.
+:::
+
 ## Options
 
 ### ga

packages/docs/docs/zh/config/README.md

@@ -78,17 +78,6 @@ module.exports = {
 
 指定 `vuepress build` 的输出目录。如果传入的是相对路径，则会基于 `process.cwd()` 进行解析。
 
-### ga
-
-- 类型: `string`
-- 默认值: `undefined`
-
-提供一个 Google Analytics ID 来使 GA 生效。
-
-::: tip 提示
-请留意 [GDPR (2018年欧盟数据保护规则改革)](https://ec.europa.eu/commission/priorities/justice-and-fundamental-rights/data-protection/2018-reform-eu-data-protection-rules_en), 在合适或者需要的情况下，考虑将 Google Analytics 设置为[匿名化的 IP](https://support.google.com/analytics/answer/2763052?hl=zh-Hans)。
-:::
-
 ### locales
 
 - 类型: `{ [path: string]: Object }`

packages/docs/docs/zh/plugin/official/plugin-google-analytics.md

@@ -29,6 +29,10 @@ module.exports = {
 }
 ```
 
+::: tip 提示
+请留意 [GDPR (2018年欧盟数据保护规则改革)](https://ec.europa.eu/commission/priorities/justice-and-fundamental-rights/data-protection/2018-reform-eu-data-protection-rules_en), 在合适或者需要的情况下，考虑将 Google Analytics 设置为[匿名化的 IP](https://support.google.com/analytics/answer/2763052?hl=zh-Hans)。
+:::
+
 ## 选项
 
 ### ga