doc: boards: align main board image name with board name

As per board porting guidelines, the board image should be named after
the board.
This commit implements the changes for boards found to be non-compliant.

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

Author: kartben

boards/actinius/icarus_som_dk/doc/img/icarus-som-dk.jpg renamed to boards/actinius/icarus_som_dk/doc/img/icarus_som_dk.jpg

@@ -6,7 +6,7 @@ Actinius Icarus SoM DK
 Overview
 ********
 
-.. figure:: img/icarus-som-dk.jpg
+.. figure:: img/icarus_som_dk.jpg
      :width: 450px
      :align: center
      :alt: Icarus SoM DK
@@ -42,7 +42,7 @@ following devices (provided directly by Nordic):
 * :abbr:`WDT (Watchdog Timer)`
 * :abbr:`IDAU (Implementation Defined Attribution Unit)`
 
-.. figure:: img/icarus-som-dk-block-diagram.jpg
+.. figure:: img/icarus_som_dk_block_diagram.jpg
      :width: 450px
      :align: center
      :alt: Icarus SoM DK Block Diagram

boards/actinius/icarus_som_dk/doc/img/icarus-som-dk-block-diagram.jpg renamed to boards/actinius/icarus_som_dk/doc/img/icarus_som_dk_block_diagram.jpg

@@ -11,7 +11,7 @@ high performance with the lowest possible power on a small physical size. In add
 which is a user-configurable RISC-V SoC based on the VexRiscv core with configurable feature set and extension.
 Using the Efinity IP Manager, you can configure the SoC to include only the peripherals that you require.
 
-.. figure:: img/ti60f225-board-top.jpg
+.. figure:: img/titanium_ti60_f225.jpg
    :align: center
    :alt: titanium_ti60_f225_board
 

boards/actinius/icarus_som_dk/doc/index.rst

@@ -13,7 +13,7 @@ over Ethernet (PoE).
 
 .. _get-started-esp32-ethernet-kit-v1.2-overview:
 
-.. figure:: img/esp32-ethernet-kit-v1.2-overview.jpg
+.. figure:: img/esp32_ethernet_kit.jpg
     :align: center
     :alt: ESP32-Ethernet-Kit V1.2
     :figclass: align-center

boards/efinix/titanium_ti60_f225/doc/img/ti60f225-board-top.jpg renamed to boards/efinix/titanium_ti60_f225/doc/img/titanium_ti60_f225.jpg

@@ -43,7 +43,7 @@ Functional Description
 The following two figures and the table below describe the key components, interfaces, and controls
 of the ESP-WROVER-KIT board.
 
-.. figure:: img/esp-wrover-kit-v4.1-layout-front.jpg
+.. figure:: img/esp_wrover_kit.jpg
      :align: center
      :alt: esp wrover front