Remove generated docs from repo

layers/waterway/README.md

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-# waterway
-
-Rivers based of OpenStreetMap [waterways](http://wiki.openstreetmap.org/wiki/Waterways) for *z8* to *z14*
-and Natural Earth rivers and lake centerlines from *z3* to *z7*.
-Too short linestrings are filtered out for some zoom levels. Waterways do no not have a `subclass`.
-
-## Fields
-
-- **class**: The original value of the [`waterway`](http://wiki.openstreetmap.org/wiki/Key:waterway) tag.
-Can be one of [`stream`](http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dstream),
-[`river`](http://wiki.openstreetmap.org/wiki/Tag:waterway%3Driver),
-[`canal`](http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dcanal),
-[`drain`](http://wiki.openstreetmap.org/wiki/Tag:waterway%3Ddrain),
-[`ditch`](http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dditch)`.
-
-## Mapping
-
-![](mapping.png)
-
-