docs/library/index: Elaborate uPy libraries intro.
docs/library/index: Elaborate uPy libraries intro.

ryannathans/micropython,MrSurly/micropython,swegener/micropython,bvernoux/micropython,pfalcon/micropython,swegener/micropython,adafruit/circuitpython,selste/micropython,kerneltask/micropython,pozetroninc/micropython,selste/micropython,adafruit/micropython,tobbad/micropython,henriknelson/micropython,MrSurly/micropython,swegener/micropython,pozetroninc/micropython,infinnovation/micropython,tralamazza/micropython,pramasoul/micropython,tralamazza/micropython,dmazzella/micropython,infinnovation/micropython,pfalcon/micropython,tralamazza/micropython,MrSurly/micropython,pozetroninc/micropython,trezor/micropython,trezor/micropython,swegener/micropython,swegener/micropython,adafruit/micropython,pfalcon/micropython,henriknelson/micropython,ryannathans/micropython,tobbad/micropython,blazewicz/micropython,blazewicz/micropython,trezor/micropython,trezor/micropython,infinnovation/micropython,ryannathans/micropython,tobbad/micropython,infinnovation/micropython,dmazzella/micropython,kerneltask/micropython,adafruit/micropython,selste/micropython,blazewicz/micropython,MrSurly/micropython,adafruit/circuitpython,pfalcon/micropython,pramasoul/micropython,infinnovation/micropython,adafruit/circuitpython,henriknelson/micropython,pfalcon/micropython,bvernoux/micropython,selste/micropython,adafruit/circuitpython,ryannathans/micropython,henriknelson/micropython,adafruit/micropython,pramasoul/micropython,trezor/micropython,bvernoux/micropython,tobbad/micropython,adafruit/micropython,bvernoux/micropython,kerneltask/micropython,henriknelson/micropython,pozetroninc/micropython,kerneltask/micropython,blazewicz/micropython,blazewicz/micropython,dmazzella/micropython,tobbad/micropython,ryannathans/micropython,pramasoul/micropython,tralamazza/micropython,dmazzella/micropython,bvernoux/micropython,kerneltask/micropython,pramasoul/micropython,adafruit/circuitpython,MrSurly/micropython,pozetroninc/micropython,selste/micropython,adafruit/circuitpython