Including Angular into your app has nothing to do with the back end framework. Also, node.js npm is a packet manager that downloads the sources and installs them where you need them, but installing manually is usually quite easy too. All you have to do is to include the link into the page header, like this:
<!doctype html>
<html ng-app>
<head>
<title>My Angular App</title>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.6/angular.min.js"></script>
</head>
<body>
</body>
</html>
If you want to save it on the server and load it from there, you can for example, open the link in your browser, right click and Save as.., then link to the location on the server, like this:<script src="https://example.com/public/js/angular.min.js"></script>.
EDIT :
Although it is possible and easy to manually install Angularjs library, managing a complex project manually may not be so easy. That's where the node npm package manager may come in handy. What you actually need is for you to figure out. To help decide what you need, check out these links:
NOTE :
IF you develop on Windows using npm, there's nothing to worry about, you only have to clone your sources as they are to the production server. Everything would be installed.
