Add battery voltage reading to web UI, apply fixed VBAT multiplier, closes #3

source/ble_config.cpp

@@ -1,5 +1,6 @@
 #include "ble_config.h"
 #include "tap.h"
+#include "battery.h"
 #include <Adafruit_LittleFS.h>
 #include <InternalFileSystem.h>
 
@@ -200,6 +201,9 @@ void pushTelemetry(unsigned long now) {
     telem.leftClicks  = statLeftClicks;
     telem.rightClicks = statRightClicks;
   #endif
+  #ifdef FEATURE_BATTERY_MONITOR
+    telem.battVoltage = readBatteryVoltage();
+  #endif
   cfgTelemetry.write ((uint8_t*)&telem, sizeof(telem));
   cfgTelemetry.notify((uint8_t*)&telem, sizeof(telem));
 }