refactor(lunr): always perform a wildcard search

[dezounet]

1. Enable lunr:

   # config.toml
   [params.search]
     enable = true
     type = "lunr"
     contentLength = 4000
     snippetLength = 200
   

2. Enable index.json generation by adding "JSON" entry to outputs.home:

   # config.toml
   [outputs]
     home = ["HTML","RSS", "JSON"]
   

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