Use luals-stubs as the source of truth for docs, instead of maintaining

separate docs stubs

Includes introducing a cool new script to turn lua-language-server's
json output into markdown documentation.

luals-stubs/power.lua

@@ -1,6 +1,7 @@
 --- @meta
 
---- Properties and functions that deal with the device's battery and power state.
+--- The `power` module contains properties and functions that relate to the
+--- device's battery and charging state.
 --- @class power
 --- @field battery_pct Property The battery's current charge, as a percentage of the maximum charge.
 --- @field battery_millivolts Property The battery's current voltage, in millivolts.