Package readme: yarn -> npm

Author: giladronat

packages/gatsby-1-config-css-modules/README.md

@@ -4,7 +4,7 @@ CSS Modules configuration for Gatsby v1 plugins
 
 ## Install
 
-`yarn add --dev gatsby-plugin-sass`
+`npm install --save-dev gatsby-plugin-sass`
 
 ## How to use
 

packages/gatsby-plugin-coffeescript/README.md

@@ -4,7 +4,7 @@ Provides drop-in support for CoffeeScript and CJSX.
 
 ## Install
 
-`yarn add gatsby-plugin-coffeescript`
+`npm install --save gatsby-plugin-coffeescript`
 
 ## How to use
 

packages/gatsby-plugin-create-client-paths/README.md

@@ -7,7 +7,7 @@ Use this plugin to simplify creating a “hybrid” Gatsby app with both statica
 Install:
 
 ```
-yarn add gatsby-plugin-create-client-paths
+npm install --save gatsby-plugin-create-client-paths
 ```
 
 Then configure via `gatsby-config.js`:

packages/gatsby-plugin-postcss-sass/README.md

@@ -5,7 +5,7 @@ support.
 
 ## Install
 
-`yarn add gatsby-plugin-postcss-sass`
+`npm install --save gatsby-plugin-postcss-sass`
 
 ## How to use
 

packages/gatsby-plugin-react-css-modules/README.md

@@ -7,7 +7,7 @@ for details.
 
 ## Install
 
-`yarn add gatsby-plugin-react-css-modules`
+`npm install --save gatsby-plugin-react-css-modules`
 
 ## How to use
 

packages/gatsby-plugin-remove-trailing-slashes/README.md

@@ -8,7 +8,7 @@ example, `yoursite.com/about/` becomes `yoursite.com/about`.
 Install:
 
 ```
-yarn add --dev gatsby-plugin-remove-trailing-slashes
+npm install --save-dev gatsby-plugin-remove-trailing-slashes
 ```
 
 Then configure via `gatsby-config.js`.

packages/gatsby-plugin-sass/README.md

@@ -4,7 +4,7 @@ Provides drop-in support for SASS/SCSS stylesheets
 
 ## Install
 
-`yarn add gatsby-plugin-sass`
+`npm install --save gatsby-plugin-sass`
 
 ## How to use
 

packages/gatsby-plugin-styled-components/README.md

@@ -6,7 +6,7 @@ built-in server-side rendering support.
 
 ## Install
 
-`yarn add gatsby-plugin-styled-components styled-components --save`
+`npm install --save gatsby-plugin-styled-components styled-components`
 
 ## How to use
 
@@ -25,4 +25,4 @@ module.exports = {
 #### v2.0.1
 
 `styled-components` is moved to a peer dependency. Installing the package
-alongside `gatsby-plugin-styled-components` is now required. Use `yarn add styled-components --save`
+alongside `gatsby-plugin-styled-components` is now required. Use `npm install --save styled-components`

packages/gatsby-plugin-styled-jsx/README.md

@@ -4,7 +4,7 @@ Provides drop-in support for [styled-jsx](https://github.com/zeit/styled-jsx).
 
 ## Install
 
-`yarn add styled-jsx gatsby-plugin-styled-jsx`
+`npm install --save styled-jsx gatsby-plugin-styled-jsx`
 
 ## How to use
 

packages/gatsby-plugin-stylus/README.md

@@ -4,7 +4,7 @@ Provides drop-in support for Stylus with or without CSS Modules
 
 ## Install
 
-`yarn add gatsby-plugin-stylus`
+`npm install --save gatsby-plugin-stylus`
 
 ## How to use