Consider providing more context and relevant page numbers when searching for a query in documents

[sunu]

We still need to build consensus around it - some people think it's good to only provide snippets of text in the search results and listing out matched pages hinder users' ability to quickly scan through results (See https://github.com/alephdata/aleph/issues/2138#issuecomment-1122048595, https://github.com/alephdata/aleph/issues/2138#issuecomment-1122409219). Others think it's useful to show matched pages for additional context (See https://github.com/alephdata/aleph/issues/2138#issuecomment-1123514854)