xorg config

Hi guys,

I run an archlinux installed with antergos 3 months ago. At this time, I installed with the mesa drivers because of a problem
with the installation assistant when trying to install nvidia drivers.

Now I want to install nvidia drivers for many reasons.

Followed the archwiki so I have done :

```
yaourt -S nvidia
yaourt -S nvidia-settings
sudo nvidia-xconfig
```

As I had no xorf.conf `nvidia-xconfig` created one. I moved it to `/etc/X11/xorg.conf.d/20-nvidia.conf` instead of
`/etc/X11/xorg.conf`.

Here is the file:
```
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 370.28  (buildmeister@swio-display-x64-rhel04-17)  Thu Sep  1 20:22:52 PDT 2016

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection