docs/esp8266/intro: Rename to "Getting started" from "Introduction".
docs/esp8266/intro: Rename to "Getting started" from "Introduction".

People tend to skip introductions (everyone knows what esp8266 is, right?),
so try to do A/B testing with a title inviting to read it.

matthewelse/micropython,bvernoux/micropython,ryannathans/micropython,tuc-osg/micropython,cwyark/micropython,turbinenreiter/micropython,infinnovation/micropython,kerneltask/micropython,HenrikSolver/micropython,henriknelson/micropython,bvernoux/micropython,redbear/micropython,selste/micropython,SHA2017-badge/micropython-esp32,jmarcelino/pycom-micropython,torwag/micropython,TDAbboud/micropython,infinnovation/micropython,trezor/micropython,infinnovation/micropython,deshipu/micropython,torwag/micropython,hiway/micropython,ryannathans/micropython,alex-march/micropython,dxxb/micropython,adafruit/circuitpython,adafruit/circuitpython,infinnovation/micropython,mhoffma/micropython,MrSurly/micropython-esp32,kerneltask/micropython,SHA2017-badge/micropython-esp32,micropython/micropython-esp32,alex-robbins/micropython,AriZuu/micropython,cwyark/micropython,chrisdearman/micropython,tobbad/micropython,cwyark/micropython,alex-robbins/micropython,pozetroninc/micropython,dmazzella/micropython,Peetz0r/micropython-esp32,pozetroninc/micropython,blazewicz/micropython,torwag/micropython,mhoffma/micropython,bvernoux/micropython,hosaka/micropython,puuu/micropython,hiway/micropython,adafruit/micropython,lowRISC/micropython,Timmenem/micropython,dmazzella/micropython,oopy/micropython,jmarcelino/pycom-micropython,pozetroninc/micropython,oopy/micropython,ganshun666/micropython,Peetz0r/micropython-esp32,adafruit/micropython,lowRISC/micropython,MrSurly/micropython,lowRISC/micropython,pfalcon/micropython,dmazzella/micropython,blazewicz/micropython,jmarcelino/pycom-micropython,MrSurly/micropython-esp32,PappaPeppar/micropython,toolmacher/micropython,infinnovation/micropython,mhoffma/micropython,ryannathans/micropython,tuc-osg/micropython,trezor/micropython,hiway/micropython,lowRISC/micropython,matthewelse/micropython,MrSurly/micropython,matthewelse/micropython,swegener/micropython,deshipu/micropython,MrSurly/micropython-esp32,jmarcelino/pycom-micropython,toolmacher/micropython,selste/micropython,hosaka/micropython,deshipu/micropython,Timmenem/micropython,trezor/micropython,tobbad/micropython,HenrikSolver/micropython,ganshun666/micropython,alex-march/micropython,hosaka/micropython,alex-march/micropython,henriknelson/micropython,selste/micropython,ganshun666/micropython,turbinenreiter/micropython,dxxb/micropython,dxxb/micropython,SHA2017-badge/micropython-esp32,mhoffma/micropython,matthewelse/micropython,chrisdearman/micropython,toolmacher/micropython,cwyark/micropython,redbear/micropython,TDAbboud/micropython,tobbad/micropython,TDAbboud/micropython,bvernoux/micropython,pramasoul/micropython,lowRISC/micropython,alex-march/micropython,adafruit/circuitpython,oopy/micropython,MrSurly/micropython-esp32,SHA2017-badge/micropython-esp32,henriknelson/micropython,bvernoux/micropython,tuc-osg/micropython,henriknelson/micropython,Timmenem/micropython,turbinenreiter/micropython,puuu/micropython,Timmenem/micropython,redbear/micropython,alex-robbins/micropython,adafruit/circuitpython,ganshun666/micropython,puuu/micropython,tralamazza/micropython,pozetroninc/micropython,jmarcelino/pycom-micropython,trezor/micropython,pramasoul/micropython,pramasoul/micropython,TDAbboud/micropython,toolmacher/micropython,mhoffma/micropython,micropython/micropython-esp32,swegener/micropython,tralamazza/micropython,matthewelse/micropython,tralamazza/micropython,pfalcon/micropython,torwag/micropython,ganshun666/micropython,micropython/micropython-esp32,kerneltask/micropython,alex-march/micropython,blazewicz/micropython,pozetroninc/micropython,PappaPeppar/micropython,micropython/micropython-esp32,chrisdearman/micropython,adafruit/circuitpython,PappaPeppar/micropython,kerneltask/micropython,matthewelse/micropython,MrSurly/micropython-esp32,adafruit/micropython,turbinenreiter/micropython,chrisdearman/micropython,ryannathans/micropython,pramasoul/micropython,Timmenem/micropython,Peetz0r/micropython-esp32,chrisdearman/micropython,kerneltask/micropython,PappaPeppar/micropython,HenrikSolver/micropython,hiway/micropython,swegener/micropython,SHA2017-badge/micropython-esp32,ryannathans/micropython,HenrikSolver/micropython,turbinenreiter/micropython,toolmacher/micropython,redbear/micropython,MrSurly/micropython,MrSurly/micropython,tobbad/micropython,pfalcon/micropython,puuu/micropython,dmazzella/micropython,blazewicz/micropython,hosaka/micropython,PappaPeppar/micropython,selste/micropython,pramasoul/micropython,cwyark/micropython,redbear/micropython,adafruit/circuitpython,hiway/micropython,tuc-osg/micropython,adafruit/micropython,oopy/micropython,alex-robbins/micropython,dxxb/micropython,AriZuu/micropython,dxxb/micropython,tralamazza/micropython,alex-robbins/micropython,trezor/micropython,hosaka/micropython,HenrikSolver/micropython,micropython/micropython-esp32,AriZuu/micropython,AriZuu/micropython,swegener/micropython,tuc-osg/micropython,Peetz0r/micropython-esp32,AriZuu/micropython,adafruit/micropython,pfalcon/micropython,blazewicz/micropython,puuu/micropython,oopy/micropython,deshipu/micropython,swegener/micropython,deshipu/micropython,Peetz0r/micropython-esp32,henriknelson/micropython,selste/micropython,pfalcon/micropython,TDAbboud/micropython,tobbad/micropython,MrSurly/micropython,torwag/micropython