boards: ct: adopt new zephyr:board directive and role

This updates the documentation of all the CThings boards
to use the new `zephyr:board::` directive.

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

boards/ct/ctcc/doc/index.rst

@@ -1,7 +1,4 @@
-.. _ctcc_nrf52840:
-
-CTHINGS.CO Connectivity Card nRF52840
-#####################################
+.. zephyr:board:: ctcc
 
 Overview
 ********

doc/releases/release-notes-3.7.rst

@@ -437,7 +437,7 @@ Boards & SoC Support
   * Added support for :zephyr:board:`Espressif ESP32-C6 DevKit-C <esp32c6_devkitc>`: ``esp32c6_devkitc``.
   * Added support for :zephyr:board:`Waveshare ESP32-S3-Touch-LCD-1.28 <esp32s3_touch_lcd_1_28>`: ``esp32s3_touch_lcd_1_28``.
   * Added support for :zephyr:board:`M5Stack ATOM Lite <m5stack_atom_lite>`: ``m5stack_atom_lite``.
-  * Added support for :ref:`CTHINGS.CO Connectivity Card nRF52840 <ctcc_nrf52840>`: ``ctcc_nrf52840``.
+  * Added support for :zephyr:board:`CTHINGS.CO Connectivity Card nRF52840 <ctcc>`: ``ctcc``.
 
 * Made these board changes: