Split platformio.ini into one file for each board, only leaving platform definitions and a handful of stale (?) boards around.. (#1141)

variants/eink0.1/platformio.ini

@@ -0,0 +1,13 @@
+; First prototype eink/nrf52840/sx1262 device (removed from build because didn't ship in quantity)
+;[env:eink0.1]
+;extends = nrf52840_base
+;board = eink0.1
+;# add our variants files to the include and src paths
+;# define build flags for the TFT_eSPI library
+;build_flags = ${nrf52_base.build_flags} -Ivariants/eink0.1
+;  -DBUSY_PIN=3 -DRST_PIN=2 -DDC_PIN=28 -DCS_PIN=30
+;src_filter = ${nrf52_base.src_filter} +<../variants/eink0.1>
+;lib_deps = 
+;  ${nrf52840_base.lib_deps}
+;  https://github.com/geeksville/EPD_Libraries.git
+;  TFT_eSPI