release v0.1.0 (#12)

* `usethis::use_news_md()`

* `usethis::use_cran_comments()`

* add (aspirational) CRAN install instructions

* ensure `"cph"`

* re: extrachecks, note citation

* temporarily redirect 404ing URL

* re`document()` with hex, copyright holder

* `usethis::use_version('minor')`

* address "Possibly misspelled words" NOTE

* single-quote package name, clarify Description

brighten the sky slightly