Replace Travis with GH Actions in landing page

Close #493

README.Rmd

@@ -17,7 +17,7 @@ is_online = curl::has_internet()
 
 <!-- badges: start -->
 [![Launch Rstudio Binder](http://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/robinlovelace/geocompr/master?urlpath=rstudio)
-![Actions](https://github.com/Robinlovelace/geocompr/workflows/Render-Book-from-master/badge.svg)
+[![Actions](https://github.com/Robinlovelace/geocompr/workflows/Render-Book-from-master/badge.svg)](https://github.com/Robinlovelace/geocompr/actions)
 [![Build Status](https://travis-ci.org/Robinlovelace/geocompr.svg?branch=master)](https://travis-ci.org/Robinlovelace/geocompr) 
 [![Docker](https://img.shields.io/docker/automated/robinlovelace/geocompr.svg)](https://hub.docker.com/r/robinlovelace/geocompr/builds/)
 [![DOI](https://zenodo.org/badge/84222786.svg)](https://zenodo.org/badge/latestdoi/84222786)

README.md

@@ -7,7 +7,7 @@
 
 [![Launch Rstudio
 Binder](http://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/robinlovelace/geocompr/master?urlpath=rstudio)
-![Actions](https://github.com/Robinlovelace/geocompr/workflows/Render-Book-from-master/badge.svg)
+[![Actions](https://github.com/Robinlovelace/geocompr/workflows/Render-Book-from-master/badge.svg)](https://github.com/Robinlovelace/geocompr/actions)
 [![Build
 Status](https://travis-ci.org/Robinlovelace/geocompr.svg?branch=master)](https://travis-ci.org/Robinlovelace/geocompr)
 [![Docker](https://img.shields.io/docker/automated/robinlovelace/geocompr.svg)](https://hub.docker.com/r/robinlovelace/geocompr/builds/)

index.Rmd

@@ -41,9 +41,9 @@ You can buy the book from [CRC Press](https://www.crcpress.com/9781138304512), [
 Inspired by [**bookdown**](https://github.com/rstudio/bookdown) and the Free and Open Source Software for Geospatial ([FOSS4G](http://foss4g.org/)) movement, this book is open source.
 This ensures its contents are reproducible and publicly accessible for people worldwide.
 
-The online version of the book is hosted at [geocompr.robinlovelace.net](https://geocompr.robinlovelace.net) and kept up-to-date by [Travis](https://travis-ci.org/Robinlovelace/geocompr), which provides information on its 'build status' as follows:
+The online version of the book is hosted at [geocompr.robinlovelace.net](https://geocompr.robinlovelace.net) and kept up-to-date by [GitHub Actions](https://github.com/Robinlovelace/geocompr/actions), which provides information on its 'build status' as follows:
 
-[![Build Status](https://travis-ci.org/Robinlovelace/geocompr.svg?branch=master)](https://travis-ci.org/Robinlovelace/geocompr)
+[![Actions](https://github.com/Robinlovelace/geocompr/workflows/Render-Book-from-master/badge.svg)](https://github.com/Robinlovelace/geocompr/actions)
 
 <!--The version of the book you are reading now was built on `r Sys.Date()` and was built `r if(is_on_travis) "on [Travis](https://travis-ci.org/Robinlovelace/geocompr)" else "locally"`.-->