move install instructions (#12)

Moved to
https://docs.pltcloud.com/peripheral/ble/nrf52840-dongle/

Author: IvoBCD

README.md

@@ -4,20 +4,9 @@ Firmware images for BLE dongles, allowing these to be used for
 [BLE Testing](https://docs.pltcloud.com/TestPlanReference/ble/)
 with the [PLT-300A](https://bcdevices.com/pages/plt-300a).
 
-Uses the HCI USB H4 interface provided by the Zephyr RTOS Bluetooth stack.
-
-- [RF52840-DONGLE (PCA10059)](https://docs.pltcloud.com/peripheral/ble/nrf52840-dongle/)
-  **hci_usb_h4** firmware image
-  ([DFU](https://github.com/bcdevices/ly11-ble-fw/releases/download/v1.1.0/hci_usb_h4-nrf52840dongle-2.7.0-dfu.zip))
-  ([.hex](https://github.com/bcdevices/ly11-ble-fw/releases/download/v1.1.0/hci_usb_h4-nrf52840dongle-2.7.0.hex))
-
-- [nRF52840DK (PCA10056)](https://docs.zephyrproject.org/3.0.0/boards/arm/nrf52840dk_nrf52840/doc/index.html)
-  **hci_usb_h4** firmware image
-  ([.hex](https://github.com/bcdevices/ly11-ble-fw/releases/download/v1.1.0/hci_usb_h4-nrf52840dk-2.7.0.hex))
-
 ## Dongle Programming
 
-- [nRF52840-DONGLE Programming instuctions](docs/program-nrf52840-dongle.rst)
+- [nRF52840-DONGLE Programming instructions](https://docs.pltcloud.com/peripheral/ble/nrf52840-dongle/)
 
 ## Docker build