[doc] Adapt README for dark and light Github modes

README.md

@@ -1,4 +1,8 @@
-[![ReFrame Logo](https://raw.githubusercontent.com/reframe-hpc/reframe/master/docs/_static/img/reframe_logo-width400p.png)](https://github.com/reframe-hpc/reframe)<br/>
+<div align="left">
+ <img src="docs/_static/img/reframe_logo-width400p.png#gh-light-mode-only" width="400px">
+ <img src="docs/_static/img/reframe-logo-dark-bg.png#gh-dark-mode-only" width="400px">
+</div>
+
 [![Build Status](https://github.com/reframe-hpc/reframe/workflows/ReFrame%20CI/badge.svg)](https://github.com/reframe-hpc/reframe/actions?query=workflow%3A%22ReFrame+CI%22)
 [![Documentation Status](https://readthedocs.org/projects/reframe-hpc/badge/?version=latest)](https://reframe-hpc.readthedocs.io/en/latest/?badge=latest)
 [![codecov.io](https://codecov.io/gh/reframe-hpc/reframe/branch/master/graph/badge.svg)](https://codecov.io/github/reframe-hpc/reframe)<br/>

README_minimal.md

@@ -0,0 +1,48 @@
+[![ReFrame Logo](https://raw.githubusercontent.com/reframe-hpc/reframe/master/docs/_static/img/reframe_logo-width400p.png)](https://github.com/reframe-hpc/reframe)<br/>
+[![Build Status](https://github.com/reframe-hpc/reframe/workflows/ReFrame%20CI/badge.svg)](https://github.com/reframe-hpc/reframe/actions?query=workflow%3A%22ReFrame+CI%22)
+[![Documentation Status](https://readthedocs.org/projects/reframe-hpc/badge/?version=latest)](https://reframe-hpc.readthedocs.io/en/latest/?badge=latest)
+[![codecov.io](https://codecov.io/gh/reframe-hpc/reframe/branch/master/graph/badge.svg)](https://codecov.io/github/reframe-hpc/reframe)<br/>
+![GitHub release (latest by date including pre-releases)](https://img.shields.io/github/v/release/reframe-hpc/reframe?include_prereleases)
+![GitHub commits since latest release](https://img.shields.io/github/commits-since/reframe-hpc/reframe/latest)
+![GitHub contributors](https://img.shields.io/github/contributors-anon/reframe-hpc/reframe)<br/>
+[![PyPI version](https://badge.fury.io/py/ReFrame-HPC.svg)](https://badge.fury.io/py/ReFrame-HPC)
+![PyPI - Python Version](https://img.shields.io/pypi/pyversions/reframe-hpc)
+[![Downloads](https://pepy.tech/badge/reframe-hpc)](https://pepy.tech/project/reframe-hpc)
+[![Downloads](https://pepy.tech/badge/reframe-hpc/month)](https://pepy.tech/project/reframe-hpc)<br/>
+[![Slack](https://reframe-slack.herokuapp.com/badge.svg)](https://reframe-slack.herokuapp.com/)<br/>
+[![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
+[![DOI](https://zenodo.org/badge/89384186.svg)](https://zenodo.org/badge/latestdoi/89384186)<br/>
+[![Twitter Follow](https://img.shields.io/twitter/follow/ReFrameHPC?style=social)](https://twitter.com/ReFrameHPC)
+
+# ReFrame in a Nutshell
+
+ReFrame is a powerful framework for writing system regression tests and benchmarks, specifically targeted to HPC systems.
+The goal of the framework is to abstract away the complexity of the interactions with the system, separating the logic of a test from the low-level details, which pertain to the system configuration and setup.
+This allows users to write portable tests in a declarative way that describes only the test's functionality.
+
+Tests in ReFrame are simple Python classes that specify the basic variables and parameters of the test.
+ReFrame offers an intuitive and very powerful syntax that allows users to create test libraries, test factories, as well as complete test workflows using other tests as fixtures.
+ReFrame will load the tests and send them down a well-defined pipeline that will execute them in parallel.
+The stages of this pipeline take care of all the system interaction details, such as programming environment switching, compilation, job submission, job status query, sanity checking and performance assessment.
+
+Please visit the project's documentation [page](https://reframe-hpc.readthedocs.io/) and [GitHub repository](https://github.com/reframe-hpc/reframe) for all the details!
+
+## Contact
+
+You can get in contact with the ReFrame community in the following ways:
+
+### Slack
+
+Please join the community's [Slack channel](https://reframe-slack.herokuapp.com) for keeping up with the latest news about ReFrame, posting questions and, generally getting in touch with other users and the developers.
+
+### Mailing list
+
+You may also [subscribe](mailto:reframe-subscribe@sympa.cscs.ch) to the [mailing list](mailto:reframe@sympa.cscs.ch).
+Only subscribers can send messages to the list.
+For unsubscribing, you may send an empty message [here](mailto:reframe-unsubscribe@sympa.cscs.ch).
+
+
+## Contributing back
+
+ReFrame is an open-source project and we welcome and encourage contributions!
+Check out our Contribution Guide [here](https://github.com/reframe-hpc/reframe/wiki/contributing-to-reframe).

setup.cfg

@@ -5,7 +5,7 @@ author = CSCS Swiss National Supercomputing Center
 description = ReFrame is a powerful framework for writing system regression tests and benchmarks, specifically targeted to HPC systems
 url = https://github.com/reframe-hpc/reframe
 license = BSD 3-Clause
-long_description = file: README.md
+long_description = file: README_minimal.md
 long_description_content_type = text/markdown
 classifiers =
     Development Status :: 5 - Production/Stable