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

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

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

Author: kartben

boards/ronoth/lodev/doc/img/lodev.jpg …ds/ronoth/lodev/doc/img/ronoth_lodev.jpgboards/ronoth/lodev/doc/img/lodev.jpg renamed to boards/ronoth/lodev/doc/img/ronoth_lodev.jpg boards/ronoth/lodev/doc/img/lodev.jpg renamed to boards/ronoth/lodev/doc/img/ronoth_lodev.jpg

@@ -1,7 +1,4 @@
-.. _ronoth_lodev:
-
-Ronoth LoDev
-############
+.. zephyr:board:: ronoth_lodev
 
 ========
 Overview
@@ -16,12 +13,6 @@ and a +20 dBm power amplifier.  Refer to `AcSIP S76S Product Information Brief`_
 
 Zephyr applications may use the **ronoth_lodev** configuration to run on this board.
 
-.. figure:: img/lodev.jpg
-     :align: center
-     :alt: Image of Ronoth LoDev open source development board containing S76S system on a chip
-
-     Ronoth LoDev
-
 `Board design files`_ are available on GitHub.
 
 ================