rebuild kws_index automatically on each data reload

For you to review:

* instead of shipping kws_index directlory, rebuilt it directly from keylearning as currently it's anyway required
* removed files not needed anymore

this goes together with changes in how mappings and kws data (keylearning + inputvalues) are updated:  https://github.com/vidma/deployment/compare/das-mongodb-map-kws?expand=1

updates to DASMaps repo: https://github.com/dmwm/DASMaps/pull/1