fix README links

README.md

@@ -45,7 +45,7 @@ The goal of this project is to make the easiest, fastest, and most painless way
 - Please see the [Documentation](http://gogs.io/docs/intro/) for project design, known issues, and change log.
 - See the [Trello Board](https://trello.com/b/uxAoeLUl/gogs-go-git-service) to follow the develop team.
 - Want to try it before doing anything else? Do it [online](https://try.gogs.io/gogs/gogs) or go down to the **Installation -> Install from binary** section!
-- Having trouble? Get help with [Troubleshooting](http://gogs.io/docs/intro/troubleshooting.md).
+- Having trouble? Get help with [Troubleshooting](http://gogs.io/docs/intro/troubleshooting.html).
 - Want to help with localization? Check out the [guide](http://gogs.io/docs/features/i18n.html)!
 
 ## Features
@@ -81,9 +81,9 @@ Make sure you install the [prerequisites](http://gogs.io/docs/installation/) fir
 
 There are 5 ways to install Gogs:
 
-- [Install from binary](http://gogs.io/docs/installation/install_from_binary)
-- [Install from source](http://gogs.io/docs/installation/install_from_source)
-- [Install from packages](http://gogs.io/docs/installation/install_from_packages)
+- [Install from binary](http://gogs.io/docs/installation/install_from_binary.html)
+- [Install from source](http://gogs.io/docs/installation/install_from_source.html)
+- [Install from packages](http://gogs.io/docs/installation/install_from_packages.html)
 - [Ship with Docker](https://github.com/gogits/gogs/tree/master/docker)
 - [Install with Vagrant](https://github.com/geerlingguy/ansible-vagrant-examples/tree/master/gogs)
 

README_ZH.md

@@ -12,7 +12,7 @@ Gogs 的目标是打造一个最简单、最快速和最轻松的方式搭建自
 - 有关项目设计、已知问题和变更日志，请通过 [使用手册](http://gogs.io/docs/intro/) 查看。
 - 您可以到 [Trello Board](https://trello.com/b/uxAoeLUl/gogs-go-git-service) 跟随开发团队的脚步。
 - 想要先睹为快？通过 [在线体验](https://try.gogs.io/gogs/gogs) 或查看 **安装部署 -> 二进制安装** 小节。
-- 使用过程中遇到问题？尝试从 [故障排查](http://gogs.io/docs/intro/troubleshooting.md) 页面获取帮助。
+- 使用过程中遇到问题？尝试从 [故障排查](http://gogs.io/docs/intro/troubleshooting.html) 页面获取帮助。
 - 希望帮助多国语言界面的翻译吗？请立即访问 [详情页面](http://gogs.io/docs/features/i18n.html)！
 
 ## 功能特性
@@ -48,9 +48,9 @@ Gogs 的目标是打造一个最简单、最快速和最轻松的方式搭建自
 
 然后，您可以通过以下 5 种方式来安装 Gogs：
 
-- [二进制安装](http://gogs.io/docs/installation/install_from_binary.md)
-- [源码安装](http://gogs.io/docs/installation/install_from_source.md)
-- [包管理安装](http://gogs.io/docs/installation/install_from_packages.md)
+- [二进制安装](http://gogs.io/docs/installation/install_from_binary.html)
+- [源码安装](http://gogs.io/docs/installation/install_from_source.html)
+- [包管理安装](http://gogs.io/docs/installation/install_from_packages.html)
 - [采用 Docker 部署](https://github.com/gogits/gogs/tree/master/docker)
 - [通过 Vagrant 安装](https://github.com/geerlingguy/ansible-vagrant-examples/tree/master/gogs)