…studio#4272)

* Revert changes in 8861645 from rstudio#4252

We compile from R sass. So we should be partial to R's compiler, no the latest in npm

* Restore original compile script (with message) that built using R-sass, not npm

* Add step in build command to update the sass output

* run new command

…tton (rstudio#4275)

* fix: add CSS workaround to hide all but the first selectize remove button

* Update news

* Apply suggestions from code review

…udio#4276)

* fix: supply and retain default selectize.js plugins (for py-shiny)

* `npm run build` (GitHub Actions)

* Move more in a 'remove_button' attribute direction

* `npm run build` (GitHub Actions)

* Move to a JSON-only approach

* `npm run build` (GitHub Actions)

* Drop sticky update logic by always sending 'missing' value and resolving client-side

* Cleanup

* Don't mutate options; better typing pattern

* `npm run build` (GitHub Actions)

---------

Co-authored-by: cpsievert <[email protected]>

* Update package.json for publishing

* Use custom readme file for npm

* Update repository URLs

* Script cleanup

* Use name @posit/shiny

…case mode (rstudio#4306)

* feat: Replace client-side markdown rendering with server-side in showcase mode

* `devtools::document()` (GitHub Actions)

* chore: callout rendering differences may happen