[Angular] remove the server wrapper from angular sample app

[evtk]

Description

I have looked into the Angular Universal solution and they do not seem to inclulde 2 tasks for building the server bundle. After some researching I have found a few simple changes in the setup of the sample Angular, which seem to produce a valid server bundle, but not only with just one build task (build:server), also half the bundle size!

Motivation

By omitting the server wrapper, we can remove the need for its additional configuration and the build:task. This definitly speeds up the development process. As a bonus: the output of the bundle is half its original size.

How Has This Been Tested?

I have tested this in our own corporate setup. We have implemented it there and was asked to provide a pull request.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update (non-breaking change; modified files are limited to the /docs directory)

Checklist:

• I have read the Contributing guide.
• My code follows the code style of this project.
• My code/comments/docs fully adhere to the Code of Conduct.
• My change is a code change and it requires an update to the documentation.
• My change is a documentation change and it requires an update to the navigation.

[illiakovalenko]

@evtk Thank you, I merged your changes in #617