Remove creating bootable usb page

if you dont know how to do this, you shouldnt be modding a chromebook

Author: WeirdTreeThing

src/.vuepress/config.js

@@ -128,10 +128,6 @@ export default {
             text: 'Known Issues',
             link: '/docs/installing/known-issues',
           },
-          {
-            text: 'Creating a Bootable USB',
-            link: '/docs/installing/bootableusb',
-          },
           {
             text: 'Installing Windows',
             link: '/docs/installing/installing-windows'