docs: Move more into Sphinx, add external modules, mention MicroPytho…

…n 1.25

README: Update mentions of MicroPython to version 1.24

har_trees: Use temporary directory

iir_q15: Try harder at avoiding ARM/Xtensa clobber

README: Mention offical info on finding .mpy version/arch

CI: Bump build dir to 0.3.0

Actually include files in the .zip

README: Update

Add citation info

README: Update status section