Merge branch 'master' into dev

README.md

-# C - Sudoku
+# Concordant Sudoku - Demo Game
 
 [![License](https://img.shields.io/badge/license-MIT-green)](https://opensource.org/licenses/MIT)
 
 This repository contains two versions of Sudoku :
-- A single-player version, used as a starting point for the [tutorial](
-  https://concordant.io/tutorial).
-- A collaborative version, using the Concordant platform API.
-  This is the outcome of the tutorial and can be tried on our
-  [sudoku demo page](https://demo.concordant.io/c-sudoku/index.html).
 
-The main repository is in [the Inria gitlab](https://gitlab.inria.fr/concordant/software/c-sudoku/) (this is where you can post tickets).  There is an identical clone in [GitHub](https://github.com/concordant/software/c-sudoku/) (tickets here might be ignored).
+- A single-player version, used as a starting point for the [tutorial](https://concordant.io/tutorial).
+- A collaborative version, using the Concordant platform API. This is the outcome of the tutorial and can be tried on our [sudoku demo page](https://demo.concordant.io/c-sudoku/index.html).