fix search engine

[layters]

• adjust price decimals when currencyBox is activated
• edit README.md
• solves / fixes Custom FTS5 Tokenizer #153
  • able to lookup words containing colons (:), hyphens (-), as well as apostrophes (')
  • port stemming (porter) still works as it did before (e.g. -ing, -es, -s, etc.)
  • prefix matching also works as it did before

Note

This is a breaking change that requires the old ~/.config/neroshop/datastore/data.sqlite3 database to be deleted before running neroshopd.