Turns names into lower-case ASCII identifiers ("Banque de France" ->
"banque_de_france"), for institution or person identifiers and file
names.
See also
Other identifiers:
hash_id(),
make_doc_id(),
pad_id()
Examples
make_slug(c("Bank of England", "Banque de France", "Österreichische Nationalbank"))
#> [1] "bank_of_england" "banque_de_france"
#> [3] "osterreichische_nationalbank"