boards: shields: Add product photos to some shields

The photos are from
https://learn.adafruit.com/assets/13421
https://learn.adafruit.com/assets/31967
https://learn.adafruit.com/assets/9187
and have the license CC BY-SA 3.0

I have cropped the photos, downsampled to width 500 px and
converted to webp.

Signed-off-by: Jonas Berg <[email protected]>

Author: pyhys

boards/shields/adafruit_2_8_tft_touch_v2/doc/adafruit_2_8_tft_touch_v2.webp

@@ -15,6 +15,12 @@ touchscreen input is supported only on Capacitive Touch version.
 More information about the shield can be found
 at the `Adafruit 2.8" TFT Touch Shield v2 website`_.
 
+.. figure:: adafruit_2_8_tft_touch_v2.webp
+   :align: center
+   :alt: Adafruit 2.8" TFT Touch Shield v2
+
+   Adafruit 2.8" TFT Touch Shield v2 (Credit: Adafruit)
+
 Pins Assignment of the Adafruit 2.8" TFT Touch Shield v2
 ========================================================
 

boards/shields/adafruit_2_8_tft_touch_v2/doc/index.rst

@@ -9,6 +9,13 @@ Overview
 The `Adafruit OLED FeatherWing Shield`_ features a SSD1306 compatible OLED display
 with a resolution of 128x32 pixels and three user buttons.
 
+.. figure:: adafruit_featherwing_128x32_oled.webp
+   :align: center
+   :alt: Adafruit FeatherWing 128x32 OLED Shield
+
+   Adafruit FeatherWing 128x32 OLED Shield (Credit: Adafruit)
+
+
 Pins Assignment of the Adafruit FeatherWing 128x32 OLED shield
 ==============================================================
 

boards/shields/adafruit_featherwing_128x32_oled/doc/adafruit_featherwing_128x32_oled.webp

@@ -12,6 +12,13 @@ UNO R3 compatible shield based on the NXP PCA9685 IC.
 More information about the shield can be found
 at the `Adafruit 16-channel PWM/Servo Shield webpage`_.
 
+.. figure:: adafruit_pca9685.webp
+   :align: center
+   :alt: Adafruit 16-channel PWM/Servo Shield
+
+   Adafruit 16-channel PWM/Servo Shield (Credit: Adafruit)
+
+
 Pins Assignments
 ================