Need reference information
As it is, the documentation is largely goal-oriented. For example:
"This site contains instruction and examples to help you accomplish your goals with the Librem 5 dev kit and phone."
As a developer, I find reference information more important than instruction.
For example, a table of all of the hardware components, like CPU, modem, audio codec, accelerometer, wlan, gnss, etc, together with links to datasheets. A good example is on page 41 (and possibly page 9) of the GTA04 manual:
A table of the main software packages used on the hardware, together with links to their home page and/or source code would also be good. For example: