Algolia plugin SearchPage does not respect configuration

## 🐛 Bug Report

Use some algolia config like:

```
algolia: {
apiKey: '47ecd3b21be71c5822571b9f59e52544',
indexName: 'docusaurus-2',
contextualSearch: true,
searchParameters: {facetFilters: ['bad:filter']},
},
```

Due to the presence of `bad:filter`, it should actually never find any result.

But the current search page does not respect the plugin configuration options.

We should rather make the search page results consistent with the navbar search input / modal results, and use the plugin options.

**Edit**: if contextual search is not enable, we should not append any facet filter to the query by default, to prevent issues such as https://github.com/facebook/docusaurus/issues/4644