add docs for Focus Mode Toggle (#100)

* add docs for Focus Mode Toggle

* update to describe hold to deactivate

Author: eliasreid

docs/add-ons/focus-mode.mdx

@@ -24,7 +24,9 @@ Please note that focus mode pin can be set on the main GPIO pin mapping page.
 
 ### Requirements
 
-The GPIO pin set in `Focus Mode Pin` needs to be brought and kept low to remain active. A toggle switch, slide toggle, or latching switch is necessary for proper use of this add-on.
+The GPIO pin set in `Focus Mode Pin` needs to be brought and kept low to remain active. A toggle switch, slide toggle, or latching switch is necessary to take advantage of the `Focus Mode Pin`.
+
+Focus mode can also be enabled and disabled via the hotkey action [Focus Mode Toggle](../hotkeys.mdx#focus-mode-toggle) (which can be configured in [Hotkeys Settings](../web-configurator/menu-pages/01-settings.mdx#hotkey-settings)). Pressing the hotkey will activate focus mode, and holding the hotkey for 3 seconds will deactivate Focus Mode.
 
 ### Installation
 

docs/hotkeys.mdx

@@ -234,3 +234,7 @@ The A1 Button hotkey is distinct from the [Touchpad Button](#touchpad-button) ho
 ## A2 Button
 
 This hotkey emulates a press of the <Hotkey buttons={["A2"]}/> button as not all controllers may have this button natively on the controller.
+
+## Focus Mode Toggle
+
+This hotkey toggles whether [Focus Mode](./add-ons/focus-mode.mdx) is active. Press to activate and hold for 3 seconds to deactivate.