feat: Introduce option maxHits: Show more or less than the default 5 hits when searching

[JohannesDienst-askui]

Introduce a new option maxHits. Before you had to go with the default 5 hits which was sometimes too few.

Now you can go with 7.

Usage

[
      require.resolve('docusaurus-lunr-search'),
      {
        maxHits: 7
      }