some words in docs about mainboard

docs/src/introduction.md

@@ -1,3 +1,9 @@
 # Introduction
 
 **TODO** work in progress
+
+Dispensy aims to be the new hardware base layer for the [UbaBot](https://www.xythobuz.de/drinkrobotics.html) by [DrinkRobotics](https://drinkrobotics.de/).
+
+The main logic and user / web interface is a [Bartendro](https://github.com/partyrobotics/bartendro) fork running on a Raspberry Pi.
+This is the modular lower level hardware, which the Pi is talking to via USB.
+The Dispensy modules communicate with each other with a CAN Bus.

docs/src/main_board.md

@@ -1,3 +1,8 @@
 # Main-Board
 
 **TODO** work in progress
+
+The main board is the heart of the machine.
+You only need one of these.
+
+It provides 5V power for the external Raspberry Pi, as well as a USB-C data connection for communication with the hardware.

hardware/dispensy.kicad_pcb

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hardware/dispensy.kicad_prl

@@ -1,7 +1,7 @@
 {
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     "active_layer": 0,
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+    "active_layer_preset": "",
     "auto_track_width": false,
     "hidden_netclasses": [],
     "hidden_nets": [],
@@ -64,7 +64,7 @@
       39,
       40
     ],
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     "zone_display_mode": 0
   },
   "meta": {