Update Sphinx docs.

[9600]

• [ ] modules/index
• [ ] modules/* (all module pages)
• [ ] ESDK module specification

Main modules page needs updating to add I2C and GPIO details. Where a module uses I2C enter the address. With GPIO enter details of pin(s) used.

All ESDK module pages need updating to add theory of operation, schematic and board plots. Some also need the main header image.

Also need to add details to the module specification page, e.g. dimensions for single and double width, with any design notes such as keep-out areas. Connector, I/O and power spec etc.

[9600]

Missing a few images:

• [ ] ESDK-EEA.jpg
• [ ] ESDK-Main-schematic.svg
• [ ] ESDK-Main-layout.png

[callumsnowden]

ESDK-EEA images were commited in 283dcffce1134c1a4ee2bbb267659c488f7a19fe

[callumsnowden]

Fixed typo in ESDK-MAIN image file paths in 84f20922fadb81cb8c316137419193869d56aeaa