Remove generated docs from repo

layers/railway/README.md

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-# railway
-
-The `railway` layer contains linestrings marking tracks from [OSM Railways](http://wiki.openstreetmap.org/wiki/Railways).
-It contains tracks for [passenger and freight trains]() and smaller tracks for [Trams](http://wiki.openstreetmap.org/wiki/Tag:railway%3Dtram) or [similar](http://wiki.openstreetmap.org/wiki/Tag:railway%3Dlight_rail) vehicles. But also tracks for [subways](http://wiki.openstreetmap.org/wiki/Tag:railway%3Dsubway), [narrow-gauge trains](http://wiki.openstreetmap.org/wiki/Tag:railway%3Dnarrow_gauge) or [historic trains](http://wiki.openstreetmap.org/wiki/Tag:railway%3Dpreserved).
-Non mainline tracks (marked with class `minor_rail`) used for [storage of trains](http://wiki.openstreetmap.org/wiki/Tag:service%3Dyard) and [maintenance](http://wiki.openstreetmap.org/wiki/Tag:service%3Dsiding) are contained in the highest zoom levels and should be styled more subtle than the mainline tracks with class `rail`.
-
-## Fields
-
-- **class**: Divides the track into mainline tracks (class `rail`) and less important tracks
-used for maintenance (class `minor_rail`).
-- **subclass**: Original value of the [`railway`](http://wiki.openstreetmap.org/wiki/Key:railway) can be one of
-`rail`, `light_rail`, `subway`, `narrow_gauge`, `preserved`, `tram`.
-- **properties**: Additional properties describing the nature of tracks. Can be either `bridge` or `tunnel`.
-
-## Mapping
-
-![](mapping.png)
-
-

layers/railway/mapping

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-digraph "Imposm Mapping" {
-	graph [rankdir=LR ranksep=3]
-		subgraph railway_linestring {
-			node [fixed_size=shape "width:"=20]
-				railway_linestring [shape=box]
-				key_railway [label=railway shape=box]
-					key_railway -> railway_linestring [label="rail
-light_rail
-subway
-narrow_gauge
-preserved
-tram"]
-		}
-}