fix urls

vignettes/advanced_features.Rmd

@@ -210,7 +210,7 @@ head(stations)
 
 For troubleshooting routing issues, you can visualise the traversal permissions of street edges, the bike safety of edges, and how transit stops are linked to streets. For these additional debug layers to be available, add `?debug_layers=true` to the URL, like this:  `http://localhost:8080?debug_layers=true`. The extra layers will be listed in the layer stack menu. 
 
-You can read more about the different debug layers in the official OTP documentation: [http://docs.opentripplanner.org/en/latest/Troubleshooting-Routing/#debug-layers](http://docs.opentripplanner.org/en/latest/Troubleshooting-Routing/#debug-layers).
+You can read more about the different debug layers in the official [OTP documentation](https://docs.opentripplanner.org/en/latest/Troubleshooting-Routing/#debug-layers).
 
 ## Analyst
 

vignettes/prerequisites.Rmd

@@ -29,15 +29,15 @@ For more on local versus remote routing services, see the Transportation chapter
 
 ### What are R and RStudio?
 
-[R](https://www.r-project.org/) is an open-source programming language and free software environment for statistical computing and graphics.  R has many capabilities for analysing data and writing software, but in this context, its ability to produce and analyse spatial data and maps is most relevant. [RStudio](https://www.rstudio.com/) is an Integrated Development Environment (IDE) for R which is free for personal use.
+[R](https://www.r-project.org/) is an open-source programming language and free software environment for statistical computing and graphics.  R has many capabilities for analysing data and writing software, but in this context, its ability to produce and analyse spatial data and maps is most relevant. [RStudio](https://posit.co/products/open-source/rstudio/) is an Integrated Development Environment (IDE) for R which is free for personal use.
 
 ### What is an R package?
 
 An R package is a small piece of software that extends the basic capabilities of R. It is a bit like how a new phone can do some things out of the box (make phone calls, send email) but you have to install apps to add extra abilities.
 
 ### Help with R
 
-To get started with R, see [An Introduction to R](https://cran.r-project.org/doc/manuals/r-release/R-intro.pdf) or from within R by running `help.start()`, introductory tutorials such as DataCamp's free Introduction to R course, or the [R tutor website](http://www.r-tutor.com/r-introduction). The [Geocomputation with R](https://geocompr.robinlovelace.net) book covers the packages and skills required to analyse spatial datasets such as those produced by OpenTripPlanner.
+To get started with R, see [An Introduction to R](https://cran.r-project.org/doc/manuals/r-release/R-intro.pdf) or from within R by running `help.start()`, introductory tutorials such as DataCamp's free Introduction to R course, or the [R tutor website](https://www.r-tutor.com/r-introduction). The [Geocomputation with R](https://geocompr.robinlovelace.net) book covers the packages and skills required to analyse spatial datasets such as those produced by OpenTripPlanner.
 
 A video tutorial for installing R and RStudio 
 
@@ -84,7 +84,7 @@ OTP is optimised for city-scale routing and performance will degrade with larger
 The OpenTripPlanner for R package requires:
 
 * R - [download R](https://cran.r-project.org/mirrors.html) selecting your country (or nearest available country)
-* RStudio - [download free version](https://www.rstudio.com/products/rstudio/download/) for personal use. RStudio is not essential but is strongly recommended.
+* RStudio - [download free version](https://posit.co/download/rstudio-desktop/) for personal use. RStudio is not essential but is strongly recommended.
 * Java **Note** The version of Java you need depends on the version of OTP you want to use.
 
 #### The correct version of Java for OTP