Tick the features you need and tune their knobs. Dependencies resolve automatically; only
values that differ from the library defaults are emitted. PlatformIO: copy the result
into your platformio.ini build_flags. Arduino IDE: switch to the
build_opt.h tab and Download it into the same folder as your .ino
— that is the only file the IDE feeds to the separately-compiled library, so a plain
#define in the sketch will not turn a feature on. Everything here is generated from
src/ServerConfig.h.