Add browser-polyfills, remove lodash assign, compact, values

(re: #6087)

data/index.js

@@ -1,5 +1,3 @@
-import _values from 'lodash-es/values';
-
 export { wikipedia as dataWikipedia } from 'wmf-sitematrix';
 
 export { dataAddressFormats } from './address-formats.json';
@@ -29,7 +27,7 @@ import whichPolygon from 'which-polygon';
 
 
 // index the osm-community-index
-var ociFeatureCollection = _values(ociFeatures).map(function(feature) {
+var ociFeatureCollection = Object.values(ociFeatures).map(function(feature) {
     // workaround for which-polygon: only supports `properties`, not `id`
     // https://github.com/mapbox/which-polygon/pull/6
     feature.properties = {