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/database.lua

@@ -1,33 +1,60 @@
 --- @meta
 
+--- The `database` module contains Properties and functions for working with
+--- the device's LevelDB-backed track database.
 --- @class database
+--- @field updating Property Whether or not a database re-index is currently in progress.
 local database = {}
 
+--- Returns a list of all indexes in the database.
 --- @return Index[]
 function database.indexes() end
 
+--- An iterator is a userdata type that behaves like an ordinary Lua iterator.
 --- @class Iterator
 local Iterator = {}
 
+--- A TrackId is a unique identifier, representing a playable track in the
+--- user's library.
 --- @class TrackId
 local TrackId = {}
 
+--- Gets the human-readable text representing this record. The `__tostring`
+--- metatable function is an alias of this function.
 --- @class Record
 local Record = {}
 
 --- @return string
 function Record:title() end
 
---- @return TrackId|Iterator(Record)
+--- Returns the value that this record represents. This may be either a track
+--- id, for records which uniquely identify a track, or it may be a new
+--- Iterator representing the next level of depth for the current index.
+---
+--- For example, each Record in the "All Albums" index corresponds to an entire
+--- album of tracks; the 'contents' of such a Record is an iterator returning
+--- each track in the album represented by the Record. The contents of each of
+--- the returned 'track' Records would be a full Track, as there is no further
+--- disambiguation needed.
+--- @return TrackId|Iterator r A track id if this is a leaf record, otherwise a new iterator for the next level of this index.
 function Record:contents() end
 
+--- An index is heirarchical, sorted, view of the tracks within the database.
+--- For example, the 'All Albums' index contains, first, a sorted list of every
+--- album name in the library. Then, at the second level of the index, a sorted
+--- list of every track within each album.
 --- @class Index
 local Index = {}
 
+--- Gets the human-readable name of this index. This is typically something
+--- like "All Albums", or "Albums by Artist". The `__tostring` metatable
+--- function is an alias of this function.
 --- @return string
 function Index:name() end
 
---- @return Iterator(Record)
+--- Returns a new iterator that can be used to access every record within the
+--- first level of this index.
+--- @return Iterator it An iterator that yields `Record`s.
 function Index:iter() end
 
 return database