Simplify installation of R dev deps (#1930)

Co-authored-by: Valeriu Predoi <valeriu.predoi@gmail.com>

doc/sphinx/source/community/introduction.rst

@@ -52,16 +52,11 @@ To install in development mode, follow these instructions.
    are installing behind a proxy that does not trust the usual pip-urls
    you can declare them with the option ``--trusted-host``, e.g.
    ``pip install --trusted-host=pypi.python.org --trusted-host=pypi.org --trusted-host=files.pythonhosted.org -e .[develop]``
--  If you want to use R diagnostics, run
-   ``esmvaltool install R`` to install the R
-   dependencies. Note that if you only want to run the lint test for R
-   scripts you will have to install the ``lintr`` package. You can do
-   that by running ``Rscript esmvaltool/install/R/setup_devutils.R``.
+-  If you want to use R diagnostics, run ``esmvaltool install R`` to install
+   the R dependencies.
 -  If you want to use Julia diagnostics, first install Julia as
    described below in section “Installing Julia”, then run
-   ``esmvaltool install Julia`` to install the Julia
-   dependencies. Install Julia dependencies after R dependencies if you
-   plan to use both.
+   ``esmvaltool install Julia`` to install the Julia dependencies.
 -  Test that your installation was successful by running
    ``esmvaltool -h``.
 -  If you log into a cluster or other device via ``ssh`` and your origin

environment.yml

@@ -23,4 +23,9 @@ dependencies:
   # Multi language support:
   - ncl>=6.5.0  # this should always install 6.6.0 though
   - r-base>=3.5
+  # R packages needed for development
+  - r-docopt
+  - r-lintr
+  - r-styler
+  - r-yaml
   - r-udunits2  # needed by the docker build