Remove default values

Fix ArduinoOTA library installation instruction

Latest compiler/toolchain doesn't seem to like them.

Update Software_Installation.md

I made the name of the .ino file a bit more expicit because initially I made a big mistake there and wanted to prevent others from making that same mistake.
Also you mixed up the Parameters for DeskLamp and Nanoleaf.

wifi and mqtt reliability

wifi keepalive improvement for reliability

MQTT processing flag

MQTT Improvements

simplified configuration to avoid conflicts
made MQTT info part of the secrets file by default
added MQTT refresh upon webpage broadcast
added Speed, Auto Play and removed QoS from MQTT status update.

[ImgBot] Optimize images

*Total -- 507.50kb -> 373.56kb (26.39%)

/software_screenshots/device_0.png -- 9.10kb -> 4.01kb (55.9%)
/software_screenshots/alexa_config.png -- 59.67kb -> 26.63kb (55.38%)
/software_screenshots/board_manager.png -- 25.52kb -> 14.09kb (44.76%)
/software_screenshots/arduinoJson.png -- 31.64kb -> 17.55kb (44.53%)
/software_screenshots/ota.png -- 30.75kb -> 17.61kb (42.72%)
/software_screenshots/mqtt.png -- 27.84kb -> 15.97kb (42.64%)
/software_screenshots/config.png -- 96.56kb -> 60.75kb (37.09%)
/web_ui.jpg -- 226.43kb -> 216.95kb (4.18%)

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