Install plugins as dev dependencies in README (#836)

Author: jgresham

site/docs/integrations/esbuild.md

@@ -10,7 +10,7 @@ A plugin for integrating vanilla-extract with [esbuild](https://esbuild.github.i
 ## Installation
 
 ```bash
-npm install @vanilla-extract/esbuild-plugin
+npm install --save-dev @vanilla-extract/esbuild-plugin
 ```
 
 ## Setup

site/docs/integrations/gatsby.md

@@ -10,7 +10,8 @@ A plugin for integrating vanilla-extract with [Gatsby](https://www.gatsbyjs.com)
 ## Installation
 
 ```bash
-npm install gatsby-plugin-vanilla-extract @vanilla-extract/babel-plugin @vanilla-extract/css @vanilla-extract/webpack-plugin
+npm install @vanilla-extract/css
+npm install --save-dev gatsby-plugin-vanilla-extract @vanilla-extract/babel-plugin @vanilla-extract/webpack-plugin
 ```
 
 ## Setup

site/docs/integrations/next.md

@@ -10,7 +10,7 @@ A plugin for integrating vanilla-extract with [Next.js](https://nextjs.org).
 ## Installation
 
 ```bash
-npm install @vanilla-extract/next-plugin
+npm install --save-dev @vanilla-extract/next-plugin
 ```
 
 ## Setup

site/docs/integrations/rollup.md

@@ -16,7 +16,7 @@ For applications we instead recommend to use Vite
 ## Installation
 
 ```bash
-npm install @vanilla-extract/rollup-plugin
+npm install --save-dev @vanilla-extract/rollup-plugin
 ```
 
 ## Setup

site/docs/integrations/vite.md

@@ -10,7 +10,7 @@ A plugin for integrating vanilla-extract with [Vite](https://vitejs.dev/).
 ## Installation
 
 ```bash
-npm install @vanilla-extract/vite-plugin
+npm install --save-dev @vanilla-extract/vite-plugin
 ```
 
 ## Setup

site/docs/integrations/webpack.md

@@ -10,7 +10,7 @@ A plugin for integrating vanilla-extract with [webpack](https://webpack.js.org).
 ## Installation
 
 ```bash
-npm install @vanilla-extract/webpack-plugin
+npm install --save-dev @vanilla-extract/webpack-plugin
 ```
 
 ## Setup