Remove testing instructions from the README

These are now maintained alongside the rest of the building instructions on the wiki. The text for the current version of libwacom is kept.

README.md

@@ -29,59 +29,7 @@ device in the kernel (see `/proc/bus/input/devices`) and in the X session (see
 Use the `libwacom-list-devices` tool to list all known devices and verify
 the tablet is not in that list.
 
-See the [wiki page on adding a new device](https://github.com/linuxwacom/libwacom/wiki/Adding-a-new-device).
-
-## To add support for a tablet to an installed libwacom
-
-If the system-provided libwacom does not include a `.tablet` file, it is
-possible to "backport" that `.tablet` file to the system-provided libwacom.
-
-### libwacom 1.10 and newer
-
-Copy the `.tablet` file into `/etc/libwacom` and run the
-`libwacom-update-db` tool. Copy the tablet's `.svg` layout file
-to `/etc/libwacom/layouts`.
-
-```
-$ cp my-tablet-file-from-upstream.tablet /etc/libwacom/
-$ cp my-tablet-file-layout.svg /etc/libwacom/layouts/
-$ libwacom-update-db /etc/libwacom
-```
-
-The tool will take care of updating udev, the hwdb, etc.
-
-### libwacom 1.9 and earlier
-
-For versions of libwacom <= 1.9, the file must be copied to
-`/usr/share/libwacom`. It may be overwritten on updates.
-
-You must update udev after installing the file. The simplest (and broadest)
-way to do this is outlined below:
-
-```
-# create the hwdb file
-$ cat <EOF > /etc/udev/hwdb.d/66-libwacom.hwdb
-# WARNING: change "Your Device Name" to the actual name of your device
-libwacom:name:Your Device Name*:input:*
- ID_INPUT=1
- ID_INPUT_TABLET=1
- ID_INPUT_JOYSTICK=0
-
-libwacom:name:Your Device Name Pad:input:*
- ID_INPUT_TABLET_PAD=1
-
-# Use this if the device is an external tablet
-libwacom:name:Your Device Name Finger:input:*
- ID_INPUT_TOUCHPAD=1
-
-# Use this if the device is a screen tablet
-libwacom:name:Your Device Name Finger:input:*
- ID_INPUT_TOUCHSCREEN=1
-
-EOF
-$ systemd-hwdb --update
-```
-Now disconnect and reconnect the device and it should be detected by libwacom.
+See [this wiki page on adding a new device and how to test it](https://github.com/linuxwacom/libwacom/wiki/Adding-a-new-device).
 
 # API Documentation