The MEANJS top level page is located under server/app/views/layout.server.view.html and is where you set header meta tags. Most everthing else on the page is programmatically inserted by angular, such as links to CSS files and Javascript files.
Any of the CSS or Javascripts files under your server/public directly are automagically added to the page. If you wish to add other, third-party scripts or stylesheets, you do so by editing your server configuration file, located at config/env/all.js.
So for example, to add the angular version of the tinymce editor to your MEANJS site, you'd edit config/env/all.js by adding CSS to module.exports.assets.lib.css and references to the tinymce editor and its angular wrapper to module.exports.assets.lib.js.
You will need to restart your server (via the 'grunt' command) if you change this file while the server is running.
UPDATE
Using mean-cli@0.6.1
to scaffold a new mean project, the default "top-level" page is located under packages/custom/meanStarter/public/views/system
where you will find two files:
- header.html - which describes the layout of the default navbar
- index.html - which lays out the content of the default page
Now, having said that, it should be noted that the "proper" way of configuring a mean server to display your own top-level homepage is to create a new mean package.
See the docs for further information.