Move param doc (#2843)

moved param doc from docs repo to here

param-docs/parameter-pages/GPIO/IO0.md

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+# Parameter `IO0`
+Default Value: `input disabled 10 false false`
+
+!!! Warning
+    This is an **Expert Parameter**! Only change it if you understand what it does!
+
+This parameter can be used to configure the GPIO `IO0` pin.
+
+!!! Warning
+    This pin is only usable with restrictions!
+    It must be disabled when the camera is used.
+    Additionally, it is used to activate Bootloader mode and must therefore be HIGH after a reset!
+
+Parameters:
+
+- `GPIO 0 state`: One of `input`, `input pullup`, `input pulldown` or `output`.
+- `GPIO 0 use interrupt`: Enable interrupt trigger
+- `GPIO 0 PWM duty resolution`: LEDC PWM duty resolution in bit
+- `GPIO 0 enable MQTT`: Enable MQTT publishing/subscribing
+- `GPIO 0 enable HTTP`: Enable HTTP write/read
+- `GPIO 0 name`: MQTT topic name (empty = `GPIO0`). Allowed characters: `a-z, A-Z, 0-9, _, -`.

param-docs/parameter-pages/GPIO/IO1.md

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+# Parameter `IO1`
+Default Value: `input disabled 10 false false`
+
+!!! Warning
+    This is an **Expert Parameter**! Only change it if you understand what it does!
+
+This parameter can be used to configure the GPIO `IO1` pin.
+
+!!! Warning
+    This pin is by default used for the serial communication as TX pin (USB logging)!
+
+Parameters:
+
+- `GPIO 1 state`: One of `input`, `input pullup`, `input pulldown` or `output`.
+- `GPIO 1 use interrupt`: Enable interrupt trigger
+- `GPIO 1 PWM duty resolution`: LEDC PWM duty resolution in bit
+- `GPIO 1 enable MQTT`: Enable MQTT publishing/subscribing
+- `GPIO 1 enable HTTP`: Enable HTTP write/read
+- `GPIO 1 name`: MQTT topic name (empty = `GPIO1`). Allowed characters: `a-z, A-Z, 0-9, _, -`.

param-docs/parameter-pages/GPIO/IO12.md

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+# Parameter `IO12`
+Default Value: `input-pullup disabled 10 false false`
+
+!!! Warning
+    This is an **Expert Parameter**! Only change it if you understand what it does!
+
+This parameter can be used to configure the GPIO `IO12` pin.
+
+!!! Note
+    This pin is usable without known restrictions!
+
+Parameters:
+
+- `GPIO 12 state`: One of `external-flash-ws281x`, `input`, `input pullup`, `input pulldown` or `output`.
+- `GPIO 12 use interrupt`: Enable interrupt trigger
+- `GPIO 12 PWM duty resolution`: LEDC PWM duty resolution in bit
+- `GPIO 12 enable MQTT`: Enable MQTT publishing/subscribing
+- `GPIO 12 enable HTTP`: Enable HTTP write/read
+- `GPIO 12 name`: MQTT topic name (empty = `GPIO12`). Allowed characters: `a-z, A-Z, 0-9, _, -`.

param-docs/parameter-pages/GPIO/IO13.md

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+# Parameter `IO13`
+Default Value: `input-pullup disabled 10 false false`
+
+!!! Warning
+    This is an **Expert Parameter**! Only change it if you understand what it does!
+
+This parameter can be used to configure the GPIO `IO13` pin.
+
+!!! Note
+    This pin is usable without known restrictions!
+
+Parameters:
+
+- `GPIO 13 state`: One of `input`, `input pullup`, `input pulldown` or `output`.
+- `GPIO 13 use interrupt`: Enable interrupt trigger
+- `GPIO 13 PWM duty resolution`: LEDC PWM duty resolution in bit
+- `GPIO 13 enable MQTT`: Enable MQTT publishing/subscribing
+- `GPIO 13 enable HTTP`: Enable HTTP write/read
+- `GPIO 13 name`: MQTT topic name (empty = `GPIO13`). Allowed characters: `a-z, A-Z, 0-9, _, -`.

param-docs/parameter-pages/GPIO/IO3.md

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+# Parameter `IO3`
+Default Value: `input disabled 10 false false`
+
+!!! Warning
+    This is an **Expert Parameter**! Only change it if you understand what it does!
+
+This parameter can be used to configure the GPIO `IO3` pin.
+
+!!! Warning
+    This pin is by default used for the serial communication as RX pin (USB logging)!
+
+Parameters:
+
+- `GPIO 3 state`: One of `input`, `input pullup`, `input pulldown` or `output`.
+- `GPIO 3 use interrupt`: Enable interrupt trigger
+- `GPIO 3 PWM duty resolution`: LEDC PWM duty resolution in bit
+- `GPIO 3 enable MQTT`: Enable MQTT publishing/subscribing
+- `GPIO 3 enable HTTP`: Enable HTTP write/read
+- `GPIO 3 name`: MQTT topic name (empty = `GPIO3`). Allowed characters: `a-z, A-Z, 0-9, _, -`.

param-docs/parameter-pages/GPIO/IO4.md

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+# Parameter `IO4`
+Default Value: `built-in-led disabled 10 false false`
+
+!!! Warning
+    This is an **Expert Parameter**! Only change it if you understand what it does!
+
+This parameter can be used to configure the GPIO `IO4` pin.
+
+!!! Warning
+    This pin is only usable with restrictions!
+    By default, it is used for build-in flash light (onboard LED).
+
+Parameters:
+
+- `GPIO 4 state`: One of `built-in-led`, `input`, `input pullup`, `input pulldown` or `output`.
+- `GPIO 4 use interrupt`: Enable interrupt trigger
+- `GPIO 4 PWM duty resolution`: LEDC PWM duty resolution in bit
+- `GPIO 4 enable MQTT`: Enable MQTT publishing/subscribing
+- `GPIO 4 enable HTTP`: Enable HTTP write/read
+- `GPIO 4 name`: MQTT topic name (empty = `GPIO4`). Allowed characters: `a-z, A-Z, 0-9, _, -`.

param-docs/parameter-pages/GPIO/LEDColor.md

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+# Parameter `LEDColor`
+Default Value: `150 150 150`
+
+Color of the attached LEDs to GPIO12 in **R**ed, **G**reen **B**lue from `0` (full off) .. `255` (full on) 
+(See `IO12` parameter).

param-docs/parameter-pages/GPIO/LEDNumbers.md

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+# Parameter `LEDNumbers`
+Default Value: `2`
+
+Number of LEDs on the external LED-stripe attached to GPIO12 (See `IO12` parameter).

param-docs/parameter-pages/GPIO/LEDType.md

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+# Parameter `LEDType`
+Default Value: `WS2812`
+Type of the `WS2812x` which is connected to GPIO12 (See `IO12` parameter).

param-docs/parameter-pages/GPIO/MainTopicMQTT.md

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+# Parameter `MainTopicMQTT`
+Default Value: `wasserzaehler/GPIO`
+
+!!! Note
+    This parameter is not accessible through the Web Interface Configuration Page!
+
+The GPIO Interface is prepared to report it's status and status changes as a MQTT topic. With this parameter you configure the MQTT main topic, under which the status is published.
+As this parameter is still experimental it can only be set manually in the `config.ini` itself and has not been tested in detail so far.