update README

packages/plugin-attachment-refs/README.md

@@ -4,19 +4,6 @@
 [![devDependencies Status](https://david-dm.org/weseek/growi-plugin-attachment-refs/dev-status.svg)](https://david-dm.org/weseek/growi-plugin-attachment-refs?type=dev)
 [![MIT License](http://img.shields.io/badge/license-MIT-blue.svg?style=flat)](LICENSE)
 
-Install
---------
-
-1. install plugin
-
-    ```bash
-    yarn add growi-plugin-attachment-refs
-    yarn add -D react-images@1.0.0 react-motion
-    ```
-
-1. build client app (see official documents)
-
-
 Examples
 -------
 

packages/plugin-lsx/README.md

@@ -11,18 +11,6 @@
 |![demo](https://cloud.githubusercontent.com/assets/1638767/26558936/46624c78-44e7-11e7-93f1-eda13b41a5cd.gif)|
 
 
-Install
---------
-
-1. install plugin
-
-    ```
-    $ npm install --save growi-plugin-lsx
-    ```
-
-1. build client app (see official documents)
-
-
 Usage
 ------
 

packages/plugin-pukiwiki-like-linker/README.md

@@ -34,17 +34,3 @@ Level 3 page is <a href="/Level1/Level2/Level3">here</a>
 <!-- HTML -->
 <a href="https://example.com/">example.com</a>
 ```
-
-Install
---------
-
-1. install plugin
-
-    ```
-    $ npm install --save growi-plugin-pukiwiki-like-linker
-    ```
-
-1. build client app (see [GROWI][growi])
-
-
-[growi]: https://github.com/weseek/growi