Remove generated docs from repo

layers/highway/README.md

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-# highway
-
-Roads or [`highway`](http://wiki.openstreetmap.org/wiki/Key:highway) in OpenStreetMap lingo.
-This layer is directly derived from the OSM road hierarchy which is why it is called `highway`. Only
-at zoom level 4 to 7 some major highways from Natural Earth are used otherwise it is only OSM data.
-It contains all roads from motorways to primary, secondary and tertiary roads to residential roads and
-foot paths. Styling the roads is the most essential part of the map. If you can put enough effort into it
-makes sense to carefully style each `subclass`. For more comfortable styling you can also just style the roads
-by `class`. Roads can have different properties, a road can have `oneway=yes` and `bridge=yes` at the same time.
-These properties are reflected in the field `properties`.
-This layer is not meant for labelling the roads (the purpose of the layer `highway_name`).
-
-The `highway` layer also contains polygons for things like plazas.
-
-## Fields
-
-- **class**: Either `motorway`, `major_road` (containing `trunk`, `primary`, `secondary` and `tertiary` roads) and `minor_road` (less important roads in the hierarchy like `residential` or `service`) or `path` for
-non vehicle paths (such as `cycleway` or `footpath`).
-- **subclass**: Original value of the [`highway`](http://wiki.openstreetmap.org/wiki/Key:highway) tag. Use this to do more
-precise styling.
-- **properties**: Additional properties describing the nature of road.
-The properties `bridge` and `tunnel` can be combined with `oneway` as well. So to style all bridges the same you
-should style both the properties `bridge` and `bridge:oneway`.
-Properties can be one of `bridge:oneway`, `tunnel:oneway`, `ramp`, `ford`, `bridge`, `tunnel` or`oneway`.
-
-## Mapping
-
-![](mapping.png)
-
-