Remove generated docs from repo

layers/boundary/README.md

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-# boundary
-
-Contains administrative boundaries as linestrings (no maritime boundaries yet) as linestrings.
-Until z7 [Natural Earth data](http://www.naturalearthdata.com/downloads/10m-cultural-vectors/10m-admin-0-countries/)
-is used after which OSM boundaries ([`boundary=administrative`](http://wiki.openstreetmap.org/wiki/Tag:boundary%3Dadministrative)) are present from z8 to z14.
-OSM data contains all [`admin_level`](http://wiki.openstreetmap.org/wiki/Tag:boundary%3Dadministrative#admin_level)
-but for most styles it makes sense to just style `admin_level=2` and `admin_level=4`.
-
-## Fields
-
-- **admin_level**: OSM [admin_level](http://wiki.openstreetmap.org/wiki/Tag:boundary%3Dadministrative#admin_level)
-indicating the level of importance of this boundary.
-At low zoom levels the Natural Earth boundaries are mapped to the equivalent admin levels.
-
-## Mapping
-
-![](mapping.png)
-
-