Document use of PHP's built-in server by default

[webmozart]

In the Getting Started section, PHP's built-in webserver should be used by default. For getting started it's irrelevant to a user how to configure Apache or Nginx. Instead, it should be possible to set up the project as easily and quickly as possible.

[webmozart]

The following command is needed to run the web server:

$ app/console server:run --router app/config/router_admin.php

[webmozart]

See also sulu/sulu#2069 and sulu/sulu#2070.

[danrot]

Just FYI: This way the website is not accessible, and only the admin routes are available. That's not really satisfying, is it?

[webmozart]

@danrot Yes, hence: sulu/sulu-standard#621 :)

[chirimoya]

FYI ... The platform.sh also needs only one front-controller. So I've added a web/app.php entrypoint which instantiates the kernel depending on the request url. sulu/sulu-standard#601