fix redirected URLs

R/html_document.R

@@ -102,9 +102,9 @@
 #'  \if{html}{\out{(🔗)}}.
 #'
 #'  If you prefer an svg icon, you can also use one using for example a direct link or downloading it from
-#'  \url{https://material.io/resources/icons/}.
+#'  \url{https://fonts.google.com/icons}.
 #'  \preformatted{
-#'  /* From https://material.io/resources/icons/
+#'  /* From https://fonts.google.com/icons
 #'     Licence: https://www.apache.org/licenses/LICENSE-2.0.html */
 #'  a.anchor-section::before {
 #'    content: url(https://fonts.gstatic.com/s/i/materialicons/link/v7/24px.svg);

README.md

@@ -29,7 +29,7 @@ See more about them in [Get Started](https://pkgs.rstudio.com/rmarkdown/articles
 
 ## Installation
 
-The easiest way to install the **rmarkdown** package is from within the [RStudio IDE](https://rstudio.com/products/rstudio/download/), but you don't need to explicitly install it or load it, as RStudio automatically does both when needed. A recent version of Pandoc (>= 1.12.3) is also required; RStudio also automatically includes this too so you do not need to download Pandoc if you plan to use rmarkdown from the RStudio IDE.
+The easiest way to install the **rmarkdown** package is from within the [RStudio IDE](https://www.rstudio.com/products/rstudio/download/), but you don't need to explicitly install it or load it, as RStudio automatically does both when needed. A recent version of Pandoc (>= 1.12.3) is also required; RStudio also automatically includes this too so you do not need to download Pandoc if you plan to use rmarkdown from the RStudio IDE.
 
 If you want to use the rmarkdown package outside of RStudio, you can install the package from CRAN as follows:
 
@@ -68,7 +68,7 @@ You can also click "Knit to HTML" again to render the full document with all cod
 
 There are two main places to get help:
 
-1. The [RStudio community](https://community.rstudio.com/c/R-Markdown/10) is a friendly place to ask any questions about rmarkdown and the R Markdown family of packages.
+1. The [RStudio community](https://community.rstudio.com/c/r-markdown/10) is a friendly place to ask any questions about rmarkdown and the R Markdown family of packages.
 
 1. [Stack Overflow](https://stackoverflow.com/questions/tagged/r-markdown) is a great source of answers to common rmarkdown questions. It is also a great place to get help, once you have created a reproducible example that illustrates your problem.
 

vignettes/rmarkdown.Rmd

@@ -123,7 +123,7 @@ cat(formatted, sep = "\n")
 
 The [R Markdown cheatsheet](https://github.com/rstudio/cheatsheets/raw/master/rmarkdown-2.0.pdf) is a one page (two-sided) reference guide you can download as a quick reference while you work.
 
-The [R Markdown Reference](https://rstudio.com/wp-content/uploads/2015/03/rmarkdown-reference.pdf) is a five page guide that lists each of the options from markdown, knitr, and pandoc that you can use to customize your R Markdown documents. 
+The [R Markdown Reference](https://www.rstudio.com/wp-content/uploads/2015/03/rmarkdown-reference.pdf) is a five page guide that lists each of the options from markdown, knitr, and pandoc that you can use to customize your R Markdown documents. 
 
 You can access both files from within the RStudio IDE: