limits version range of unidecode

moves unidecode from build requirements to run time requirements

update pyproject.toml to include description and python version

if [[ -z "${DEBUG}" ]]; then
  cap files location local var/data --default
  curl -XDELETE http://localhost:9200/_all
fi

general updates

* added exception type for empty string
* updated checks in algorithms
* updated tests
* moved to new flit publishing method using pyproject.toml