Start v1.8.1.1 release candidate (rstudio#4020)

* Start v1.8.1.1 release candidate

* `yarn build` (GitHub Actions)

* Sync package version (GitHub Actions)

* Remove alpha from npm version

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

v1.8.1 release candidate (rstudio#4008)

* Start v1.8.1 release candidate

* Update urls and yarn build

* Sync package version (GitHub Actions)

* Check-in revdep results

* Groom news

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

Latest shiny version used in py-shiny (dev)

v1.8.0 release candidate (rstudio#3928)

Remove alpha from the npm version

1.7.5 release candidate (rstudio#3867)

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

shiny v1.7.4.1

Remove use of as.numeric_version()
Closes rstudio#3849

Change header syntax in NEWS.md (to match what usethis does)

Squelch R CMD check message

"Package has help file(s) containing install/render-stage \Sexpr{} expressions but no prebuilt PDF manual."

Shiny 1.7.2 on CRAN