Break big Fuel screens file into smaller files

2000-install-boot.rst -- includes files in initialize-fuel subdirectory

3000-create-environment.rst -- includes files in create-environment subdirectory

4000-configure-environment -- includes files in configure-environment subdirectory and configure-environment/settings sub-subdirectory

5000-deploy-environment.rst -- includes files in stop_reset subdirectory

No content changes in this commit.

Change-Id: I812c88e250b182cf2cec95f443ef395493c3be0e