Added and tweaked many images, removed drop shadows

src/en/overlay/ab-1-wire-plus.md

@@ -3,6 +3,7 @@
 name: 1 Wire Pi Plus
 class: board
 type: other
+image: 'ab-1-wire-pi-plus.png'
 manufacturer: AB Electronics UK
 description: 1-Wire to I2C host interface
 url: https://www.abelectronics.co.uk/p/60/1-Wire-Pi-Plus

src/en/overlay/ab-adc-differential-pi.md

@@ -3,6 +3,7 @@
 name: ADC Differential Pi
 class: board
 type: other
+image: 'ab-adc-differential-pi.png'
 manufacturer: AB Electronics UK
 description: 8 channel Analogue to Digital Converter
 url: https://www.abelectronics.co.uk/p/65/ADC-Differential-Pi-Raspberry-Pi-Analogue-to-Digital-converter

src/en/overlay/ab-adc-pi-plus.md

@@ -3,6 +3,7 @@
 name: ADC Pi Plus
 class: board
 type: other
+image: 'ab-adc-pi-plus.png'
 manufacturer: AB Electronics UK
 description: 8 channel Analogue to Digital Converter
 url: https://www.abelectronics.co.uk/p/56/ADC-Pi-Plus-Raspberry-Pi-Analogue-to-Digital-converter

src/en/overlay/ab-io-pi-plus.md

@@ -3,6 +3,7 @@
 name: IO Pi Plus
 class: board
 type: other
+image: 'ab-io-pi-plus.png'
 manufacturer: AB Electronics UK
 description: 32 Channel Digital Expansion Board
 url: https://www.abelectronics.co.uk/p/54/IO-Pi-Plus

src/en/overlay/ab-rtc-pi-plus.md

@@ -3,6 +3,7 @@
 name: RTC Pi Plus
 class: board
 type: other
+image: 'ab-rtc-pi-plus.png'
 manufacturer: AB Electronics UK
 description: Real-Time Clock Module for the Raspberry Pi
 url: https://www.abelectronics.co.uk/p/52/RTC-Pi-Plus

src/en/overlay/ab-serial-pi-plus.md

@@ -3,6 +3,7 @@
 name: Serial Pi Plus
 class: board
 type: other
+image: 'ab-serial-pi-plus.png'
 manufacturer: AB Electronics UK
 description: UART to RS232 Converter
 url: https://www.abelectronics.co.uk/p/51/Serial-Pi-Plus