update how to build and remove docs link (#2906)

README.md

@@ -55,20 +55,10 @@ Overload processing: Task queue mechanism, the number of schedulable tasks on a
 ![monitor](https://user-images.githubusercontent.com/59273635/75625839-c698a480-5bfc-11ea-8bbe-895b561b337f.png)
 ![security](https://user-images.githubusercontent.com/15833811/75236441-bfd2f180-57f8-11ea-88bd-f24311e01b7e.png)
 ![treeview](https://user-images.githubusercontent.com/15833811/75217191-3fe56100-57d1-11ea-8856-f19180d9a879.png)
-### Document
-
-- <a href="https://dolphinscheduler.apache.org/en-us/docs/1.2.0/user_doc/backend-deployment.html" target="_blank">Backend deployment documentation</a>
-
-- <a href="https://dolphinscheduler.apache.org/en-us/docs/1.2.0/user_doc/frontend-deployment.html" target="_blank">Front-end deployment documentation</a>
-
-- [**User manual**](https://dolphinscheduler.apache.org/en-us/docs/1.2.0/user_doc/system-manual.html?_blank "System manual")
-
-- [**Upgrade document**](https://dolphinscheduler.apache.org/en-us/docs/1.2.0/user_doc/upgrade.html?_blank "Upgrade document")
+### Online Demo
 
 - <a href="http://106.75.43.194:8888" target="_blank">Online Demo</a>
 
-More documentation please refer to <a href="https://dolphinscheduler.apache.org/en-us/docs/1.2.0/user_doc/quick-start.html" target="_blank">[DolphinScheduler online documentation]</a>
-
 ### Recent R&D plan
 Work plan of Dolphin Scheduler: [R&D plan](https://github.com/apache/incubator-dolphinscheduler/projects/1), Under the `In Develop` card is what is currently being developed, TODO card is to be done (including feature ideas)
 
@@ -86,9 +76,8 @@ Welcome to participate in contributing, please refer to the process of submittin
 Artifact:
 
 ```
-dolphinscheduler-dist/dolphinscheduler-backend/target/apache-dolphinscheduler-incubating-${latest.release.version}-dolphinscheduler-backend-bin.tar.gz: Binary package of DolphinScheduler-Backend
-dolphinscheduler-dist/dolphinscheduler-front/target/apache-dolphinscheduler-incubating-${latest.release.version}-dolphinscheduler-front-bin.tar.gz: Binary package of DolphinScheduler-UI
-dolphinscheduler-dist/dolphinscheduler-src/target/apache-dolphinscheduler-incubating-${latest.release.version}-src.zip: Source code package of DolphinScheduler
+dolphinscheduler-dist/target/apache-dolphinscheduler-incubating-${latest.release.version}-dolphinscheduler-bin.tar.gz: Binary package of DolphinScheduler
+dolphinscheduler-dist/target/apache-dolphinscheduler-incubating-${latest.release.version}-src.zip: Source code package of DolphinScheduler
 ```
 
 ### Thanks

README_zh_CN.md

@@ -50,20 +50,10 @@ Dolphin Scheduler Official Website
 
 ![security](https://user-images.githubusercontent.com/15833811/75209633-baa28200-57b9-11ea-9def-94bef2e212a7.jpg)
 
-### 文档
-
-- <a href="https://dolphinscheduler.apache.org/zh-cn/docs/1.2.0/user_doc/backend-deployment.html" target="_blank">后端部署文档</a>
-
-- <a href="https://dolphinscheduler.apache.org/zh-cn/docs/1.2.0/user_doc/frontend-deployment.html" target="_blank">前端部署文档</a>
-
-- [**使用手册**](https://dolphinscheduler.apache.org/zh-cn/docs/1.2.0/user_doc/system-manual.html?_blank "系统使用手册")
-
-- [**升级文档**](https://dolphinscheduler.apache.org/zh-cn/docs/1.2.0/user_doc/upgrade.html?_blank "升级文档")
+### 我要体验
 
 - <a href="http://106.75.43.194:8888" target="_blank">我要体验</a>
 
-更多文档请参考 <a href="https://dolphinscheduler.apache.org/zh-cn/docs/1.2.0/user_doc/quick-start.html" target="_blank">DolphinScheduler中文在线文档</a>
-
 
 ### 近期研发计划
 
@@ -83,9 +73,8 @@ DolphinScheduler的工作计划：<a href="https://github.com/apache/incubator-d
 Artifact:
 
 ```
-dolphinscheduler-dist/dolphinscheduler-backend/target/apache-dolphinscheduler-incubating-${latest.release.version}-dolphinscheduler-backend-bin.tar.gz: Binary package of DolphinScheduler-Backend
-dolphinscheduler-dist/dolphinscheduler-front/target/apache-dolphinscheduler-incubating-${latest.release.version}-dolphinscheduler-front-bin.tar.gz: Binary package of DolphinScheduler-UI
-dolphinscheduler-dist/dolphinscheduler-src/target/apache-dolphinscheduler-incubating-${latest.release.version}-src.zip: Source code package of DolphinScheduler
+dolphinscheduler-dist/target/apache-dolphinscheduler-incubating-${latest.release.version}-dolphinscheduler-bin.tar.gz: Binary package of DolphinScheduler
+dolphinscheduler-dist/target/apache-dolphinscheduler-incubating-${latest.release.version}-src.zip: Source code package of DolphinScheduler
 ```
 
 ### 感谢