* use logical `NA` that can be cast to character

* chore: Use ggplot2's default color scale `na.value`

* chore: document()

* chore: Also set `na.value = "grey50"` in `scale_xaringan_discrete()`.

* chore: Add news item

---------

Co-authored-by: Garrick Aden-Buie <garrick@adenbuie.com>

* Increment version number to 0.4.3

* chore: add cran comments

* Fix indents and invisible characters (GitHub Actions)

* Re-build README.Rmd (GitHub Actions)

* Re-build index.Rmd (GitHub Actions)

* chore: urlchecker::url_update()

* chore: align and register s3 print methods

* tests: Update and fix tests

* docs: update link in thanks

---------

Co-authored-by: gadenbuie <gadenbuie@users.noreply.github.com>

* use UK spelling of colour

* Increment version number to 0.4.2.9000

* docs: add NEWS item

* chore: devtools::document()

---------

Co-authored-by: Garrick Aden-Buie <garrick@adenbuie.com>

Co-authored-by: gadenbuie <gadenbuie@users.noreply.github.com>

Closes #67
Thanks @andrewpbray

Updates color examples and adds left-column headings demo to skeleton

Fixes #53

Fixes #50

Fixes #41

Fixes #44

This way, warning show up in the console when rendering

- Move long intro to pkgdown
- README is now much shorter
- Rename pkgdown "Get Started" to "Features"
- Add ggplot theme to quick intro
- Add pkgdown docs link to description

Avoids note for long argument length and allows for more consistent checking if supplied arguments are default values

Closes #33

E.g. primary_color and secondary_color in style_duo() become --primary and --secondary