[ADF-2189] new search facets (#3230)

* slider facet

* number range facet

* unit tests

* remove fdescribe

* remove old demo-only content

* remove old tests

* Support "include" and "field" values with app config

* exclude deprecated demo content from export checks

lib/content-services/material.module.ts

@@ -34,7 +34,8 @@ import {
     MatCheckboxModule,
     MatDatepickerModule,
     MatSlideToggleModule,
-    MatRadioModule
+    MatRadioModule,
+    MatSliderModule
 } from '@angular/material';
 
 export function modules() {
@@ -56,7 +57,8 @@ export function modules() {
         MatCheckboxModule,
         MatDatepickerModule,
         MatSlideToggleModule,
-        MatRadioModule
+        MatRadioModule,
+        MatSliderModule
     ];
 }