Increase DocSearch results per section from 5 to 20

Add maxResultsPerGroup parameter to show up to 20 results per
hierarchical section instead of the default 5. This improves
discoverability when using section filters or searching popular
terms.

Before: Hard limit of 5 results per section (no 'show more')
After: Shows up to 20 results per section

Author: fdevans

docs/.vuepress/config.ts

@@ -129,6 +129,7 @@ export default defineUserConfig({
         appId: 'GRSXNRCDRG',
         apiKey: 'c463f74d6f36a5af808650e0f69aadfa',
         indexName: 'prod_rundeck_docs',
+        maxResultsPerGroup: 20,
         searchParameters: {
           hitsPerPage: 100,
           facetFilters: [`version:${setup.base}`],