_init.lua should not use node.flashindex anymore as it is deprecated

[HHHartmann]

Expected behavior

don't use node.flashindex as it is deprecated

Maybe even deprecate the LFS stuff in there as we now have node.LFS. Just leave in the loader configuration and loadfile/dofile.

Test code

see lua_examples/lfs/_init.lua

NodeMCU startup banner

NodeMCU 3.0.0.0 branch: tmr.softwd commit: c4baa9f3b97a7ceba8a021ad9608dad5855393e8 release: 3.0-master_20200910 +39 release DTS: SSL: false build type: float LFS: 0x40000 bytes total capacity modules: adc,bit,color_utils,crypto,dht,encoder,enduser_setup,file,gpio,gpio_pulse,http,i2c,l3g4200d,mdns,net,node,ow,pipe,pwm,rtcfifo,rtcmem,rtctime,sjson,sntp,spi,struct,tls,tmr,uart,wifi,wifi_monitor,ws2812,ws2812_effects build 2020-11-09 20:08 powered by Lua 5.1.4 on SDK 3.0.1-dev(fce080e)

Hardware

generic ESP8266

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[HHHartmann]

Still to be done