[SYS] Password management improvements (#1787)

* Use one single password for Access point, OTA and WebUI access
* Enable to change the password during WM onboarding, with the WebUI, and MQTT command
* Remove the default password during the first configuration to connect to the AP
* When using the last 8 digits of the MAC as the password, it can now be changed
* Remove gateway password sending to client

docs/use/gateway.md

@@ -54,6 +54,12 @@ This command can also be used with other controllers that does not support the i
 If the new connection fails the gateway will fallback to the previous connection.
 :::
 
+## Change the Gateway password
+
+The password must be 8 characters minimum.
+
+`mosquitto_pub -t "home/OpenMQTTGateway/commands/MQTTtoSYS/config" -m '{"gw_pass":"12345678"}'`
+
 ## Change the MQTT broker credentials
 ```
 mosquitto_pub -t "home/OpenMQTTGateway/commands/MQTTtoSYS/config" -m

docs/use/webui.md

@@ -10,7 +10,7 @@ For ESP32 based environments a WebUI is available to provide basic configuration
 
 # Login Authentication
 
-By default access to the WebUI uses basic authentication to control access to your OpenMQTTGateway Device.  The login is `admin` and the password is your ota_password (if unchanged, the default ota_password is `OTAPASSWORD`).
+By default access to the WebUI uses basic authentication to control access to your OpenMQTTGateway Device.  The login is `admin` and the password is your `gateway password` (if unchanged during onboarding there is no password).
 
 ::: warning
 The communication with the WebUI is not encrypted, which means that your data may be visible on your local network.