Remove indent in installation instructions

Co-authored-by: Keith Cirkel <[email protected]>

Author: koddsson

README.md

@@ -3,10 +3,10 @@
 A modal dialog opened with a <details> button.
 
 ## Installation
-  Available on [npm](https://www.npmjs.com/) as [**@github/details-dialog-element**](https://www.npmjs.com/package/@github/details-dialog-element).
-    ```
-  $ npm install --save @github/details-dialog-element
-  ```
+Available on [npm](https://www.npmjs.com/) as [**@github/details-dialog-element**](https://www.npmjs.com/package/@github/details-dialog-element).
+```
+$ npm install --save @github/details-dialog-element
+```
 
 ## Usage
 
@@ -24,8 +24,6 @@ Include with a script tag:
 <script type="module" src="./node_modules/@github/details-dialog-element/dist/index.js">
 ```
 
-### details-dialog
-
 ### Markup
 
 ```html

cem-plugin-readme.js

@@ -2,10 +2,10 @@ import {accessSync, readFileSync, writeFileSync} from 'fs'
 
 function generateInstallationInstructions({packageJson: {name}}) {
   return `## Installation
-  Available on [npm](https://www.npmjs.com/) as [**${name}**](https://www.npmjs.com/package/${name}).
-    \`\`\`
-  $ npm install --save ${name}
-  \`\`\``
+Available on [npm](https://www.npmjs.com/) as [**${name}**](https://www.npmjs.com/package/${name}).
+\`\`\`
+$ npm install --save ${name}
+\`\`\``
 }
 
 function generateBrowserSupportInstructions() {