docs: update readme

docs: more readme changes

docs: more changes

docs: more badges

Author: m-muecke

README.md

@@ -1,27 +1,28 @@
-FDboost
-======
+# FDboost
 
-[![Build Status (Linux)](https://travis-ci.org/boost-R/FDboost.svg?branch=master)](https://travis-ci.org/boost-R/FDboost)
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+
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+[![CRAN RStudio mirror downloads](https://cranlogs.r-pkg.org/badges/FDboost)](https://www.r-pkg.org/pkg/FDboost)
+
+<!-- badges: end -->
 
 `FDboost` Boosting Functional Regression Models.
 
-The package FDboost fits regression models for functional data, i.e., 
+The package FDboost fits regression models for functional data, i.e.,
 scalar-on-function, function-on-scalar, and function-on-function regression models,
-by a component-wise gradient boosting algorithm. 
+by a component-wise gradient boosting algorithm.
 Furthermore, it can be used to fit density-on-scalar regression models.
 
 ## Using FDboost
 
 For installation instructions see below.
 
 Instructions on how to use `FDboost` can be found in various places:
+
 - Read the tutorial paper [doi:10.18637/jss.v094.i10](doi:10.18637/jss.v094.i10)
 - Have a look at the manual, which also contains example code
-- Check the vignettes: 
+- Check the vignettes:
   - [function-on-function regression](https://cran.r-project.org/web/packages/FDboost/vignettes/FLAM_canada.pdf)
   - [scalar-on-function regression](https://cran.r-project.org/web/packages/FDboost/vignettes/FLAM_fuel.pdf)
   - [function-on-scalar regression](https://cran.r-project.org/web/packages/FDboost/vignettes/FLAM_viscosity.pdf)
@@ -31,30 +32,17 @@ Instructions on how to use `FDboost` can be found in various places:
 
 For issues, bugs, feature requests etc. please use the [GitHub Issues](https://github.com/boost-R/FDboost/issues).
 
-## Installation Instructions
-
-- Current version (from CRAN):
-  ```r
-  install.packages("FDboost")
-  ```
-
-- Latest **patch version** (patched version of CRAN package; under development) from GitHub:
-  ```r
-  library("devtools")
-  install_github("boost-R/FDboost") 
-  library("FDboost")
-  ```
-
-<!-- - Latest **development version** (version with new features; under development) from GitHub:
-  ```r
-  library("devtools")
-  install_github("boost-R/mboost", ref = "devel")
-  library("mboost")
-  ```
--->
-
-  To be able to use the `install_github()` command, one needs to install `devtools` first:
-  ```r
-  install.packages("devtools")
-  ```
+## Installation
+
+Install the last release from [CRAN](https://cran.r-project.org):
+
+```r
+install.packages("FDboost")
+```
+
+Install the development version from [GitHub](https://github.com/):
 
+```r
+# install.packages("pak")
+pak::pak("boost-R/FDboost")
+```