Interface data storage in PROGMEM (#71)

Adds a webpack plugin to package interface as PROGMEM into a header file in the framework.
Adds a build flag to optionally enable serving from PROGMEM or SPIFFS as required
Adds documentation changes to describe changes

platformio.ini

@@ -1,35 +1,40 @@
-; PlatformIO Project Configuration File
-;
-;   Build options: build flags, source filter
-;   Upload options: custom upload port, speed and extra flags
-;   Library options: dependencies, extra library storages
-;   Advanced options: extra scripting
-;
-; Please visit documentation for the other options and examples
-; http://docs.platformio.org/page/projectconf.html
-[env:esp12e]
-platform = espressif8266
-board = esp12e
-board_build.f_cpu = 160000000L
-
-extra_scripts = pre:timelib_fix.py
-
-framework = arduino
-monitor_speed = 115200
-
-; Uncomment & modify the lines below in order to configure OTA updates
-;upload_flags = 
-;  --port=8266 
-;  --auth=esp-react
-;upload_port = 192.168.0.11
+[platformio]
+default_envs = esp12e
+;default_envs = node32s
 
+[env]
 build_flags=
   -D NO_GLOBAL_ARDUINOOTA
   ; Uncomment ENABLE_CORS to enable Cross-Origin Resource Sharing (required for local React development)
   ;-D ENABLE_CORS
   -D CORS_ORIGIN=\"http://localhost:3000\"
+  ; Uncomment PROGMEM_WWW to enable the storage of the WWW data in PROGMEM
+  ;-D PROGMEM_WWW
+
+; Uncomment & modify the lines below in order to configure OTA updates
+;upload_flags = 
+;  --port=8266 
+;  --auth=esp-react
+;upload_port = 192.168.0.11  
+
+framework = arduino
+monitor_speed = 115200
+
+extra_scripts = 
+  pre:scripts/timelib_fix.py
+  pre:scripts/build_interface.py
+
 lib_deps =
   NtpClientLib@>=2.5.1,<3.0.0
   ArduinoJson@>=6.0.0,<7.0.0
   ESP Async WebServer@>=1.2.0,<2.0.0
-  AsyncTCP@>=1.0.3,<2.0.0
+
+[env:esp12e]
+platform = espressif8266
+board = esp12e
+board_build.f_cpu = 160000000L
+
+[env:node32s]
+;board_build.partitions = min_spiffs.csv
+platform = espressif32
+board = node32s