Removing "timing" build, cleanup ini file

firmware/main_mcu/platformio.ini

@@ -19,7 +19,7 @@ src_filter =
 	-<tests/>
 	-<src/config-example.h>
 
-[env:button-release]
+[hardware]
 platform = espressif8266
 framework = arduino
 board = esp12e
@@ -30,28 +30,11 @@ lib_deps =
 	hieromon/AutoConnect@^1.2.2
 upload_speed = 115200
 
-[env:button-timing]
-platform = espressif8266
-framework = arduino
-board = esp12e
-lib_ldf_mode = deep+ ;; Required for Platformio to identify some transitive dependencies of AutoConnect
-lib_deps =
-	knolleary/PubSubClient@^2.8.0
-	bblanchon/ArduinoJson@^6.17.2
-	hieromon/AutoConnect@^1.2.2
-upload_speed = 115200
-build_flags = -D DEBUG_SKETCH_TIMING
+[env:release]
+extends = hardware
 
-[env:button-debug]
-platform = espressif8266
-framework = arduino
-board = esp12e
-lib_ldf_mode = deep+ ;; Required for Platformio to identify some transitive dependencies of AutoConnect
-lib_deps =
-	knolleary/PubSubClient@^2.8.0
-	bblanchon/ArduinoJson@^6.17.2
-	hieromon/AutoConnect@^1.2.2
-upload_speed = 115200
+[env:debug]
+extends = hardware
 build_flags = -D DEBUG_SKETCH
 
 [env:native]