docs: update readme and example

Author: erezrokah

README.md

@@ -7,14 +7,14 @@ A Netlify plugin to generate a lighthouse report for every deploy
 This plugin can be included via npm. Install it as a dependency with the following command:
 
 ```bash
-npm install --save netlify-plugin-lighthouse
+npm install --save "@netlify/plugin-lighthouse"
 ```
 
 To use a build plugin, create a `plugins` in your `netlify.toml` like so:
 
 ```toml
 [[plugins]]
-package = "netlify-plugin-lighthouse"
+package = "@netlify/plugin-lighthouse"
   [plugins.inputs]
   # optional, defaults to scanning the current built version of the site
   audit_url = 'https://www.my-custom-site.com'

netlify.toml

@@ -7,7 +7,7 @@
     YARN_VERSION = "1.22.4"
 
 [[plugins]]
-package = "./index.js"
+package = "./src/index.js"
   [plugins.inputs.thresholds]
     performance = 0.9
     accessibility = 0.9