Move endpoint to config file

src/server/sparql/FacetConfigsSampo.js

+export const endpoint = 'http://ldf.fi/mmm/sparql'
+// export const endpoint = 'http://localhost:3050/ds/sparql';
+
 /* TODO:
   labelPath is only used when sorting results, so it should removed from
   facet configs

src/server/sparql/FacetResults.js

@@ -2,7 +2,6 @@ import { runSelectQuery } from './SparqlApi'
 import { runNetworkQuery } from './NetworkApi'
 import { prefixes } from './SparqlQueriesPrefixes'
 import {
-  endpoint,
   countQuery,
   facetResultSetQuery,
   instanceQuery
@@ -27,7 +26,7 @@ import {
   actorsAt,
   allPlacesQuery
 } from './SparqlQueriesPlaces'
-import { facetConfigs } from './FacetConfigsSampo'
+import { facetConfigs, endpoint } from './FacetConfigsSampo'
 import { mapCount, mapPlaces } from './Mappers'
 import { makeObjectList } from './SparqlObjectMapper'
 import { generateConstraintsBlock } from './Filters'

src/server/sparql/FacetValues.js

 import { runSelectQuery } from './SparqlApi'
 import { has } from 'lodash'
 import {
-  endpoint,
   facetValuesQuery,
   facetValuesQueryTimespan,
   facetValuesRange
 } from './SparqlQueriesGeneral'
 import { prefixes } from './SparqlQueriesPrefixes'
-import { facetConfigs } from './FacetConfigsSampo'
+import { facetConfigs, endpoint } from './FacetConfigsSampo'
 import {
   hasPreviousSelections,
   hasPreviousSelectionsFromOtherFacets,

src/server/sparql/SparqlQueriesGeneral.js

-export const endpoint = 'http://ldf.fi/mmm/sparql'
-// export const endpoint = 'http://localhost:3050/ds/sparql';
-
 export const instanceQuery = `
   SELECT * {
     BIND(<ID> as ?id)