houses: keep Kamernet to the Gouda region (small-city pages are padded with listings from all over NL), share GOUDA_REGION

src/routes/trackers/houses/+page.server.ts

@@ -29,22 +29,10 @@ import {
 	normalizeKeys,
 	toColumns
 } from '#lib/house-tracker/manual.js';
+import { GOUDA_REGION } from '#lib/house-tracker/address.js';
 import type { Actions, PageServerLoad } from './$types';
 
-// The area Stan and Juhee are looking in (same list as the "Gouda area rentals" alert rule).
-const REGION = [
-	'gouda',
-	'waddinxveen',
-	'reeuwijk',
-	'moordrecht',
-	'nieuwerkerk-aan-den-ijssel',
-	'zevenhuizen',
-	'bodegraven',
-	'boskoop',
-	'oudewater',
-	'schoonhoven',
-	'haastrecht'
-] as const;
+const REGION = GOUDA_REGION;
 const DEFAULTS = { city: 'region', max: '1800', area: '35' } as const;
 
 const int = (value: string | null) => {