docs: Move config reference information to new Config_Reference.md

Move all the config reference information from files in the config/
directory to a new Config_Reference.md document.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

config/example-polar.cfg

@@ -1,27 +1,17 @@
-# This file serves as documentation for config parameters of "polar"
-# style printers. One may copy and edit this file to configure a new
-# polar printer.
+# This file is an example config file for polar style printers. One
+# may copy and edit this file to configure a new polar printer.
 
 # POLAR KINEMATICS ARE A WORK IN PROGRESS. Moves around the 0,0
 # position are known to not work properly.
 
-# Only parameters unique to polar printers are described here - see
-# the "example.cfg" file for description of common config parameters.
+# See docs/Config_Reference.md for a description of parameters.
 
-# The stepper_bed section is used to describe the stepper controlling
-# the bed.
 [stepper_bed]
 step_pin: ar54
 dir_pin: ar55
 enable_pin: !ar38
 step_distance: 0.001963495
-#   On a polar printer the step_distance is the amount each step pulse
-#   moves the bed in radians (for example, a 1.8 degree stepper with
-#   16 micro-steps would be 2 * pi * (1.8 / 360) / 16 == 0.001963495).
-#   This parameter must be provided.
 
-# The stepper_arm section is used to describe the stepper controlling
-# the carriage on the arm.
 [stepper_arm]
 step_pin: ar60
 dir_pin: ar61
@@ -32,8 +22,6 @@ position_endstop: 300
 position_max: 300
 homing_speed: 50
 
-# The stepper_z section is used to describe the stepper controlling
-# the Z axis.
 [stepper_z]
 step_pin: ar46
 dir_pin: ar48
@@ -77,7 +65,6 @@ pin_map: arduino
 
 [printer]
 kinematics: polar
-#   This option must be "polar" for polar printers.
 max_velocity: 300
 max_accel: 3000
 max_z_velocity: 25