docs: README header harmonization

Author: chloe-renaud

README.md

@@ -1,6 +1,6 @@
-<img align="right" src="docs/img/pogues-logo.png" alt="Pogues logo"/>
-
-# Pogues
+<p align="center">
+  <img alt="Pogues" src="docs/img/pogues-logo.png" style="max-width: 100%;">
+</p>
 
 Pogues is a questionnaire design and test tool.
 
@@ -9,4 +9,6 @@ Pogues is a questionnaire design and test tool.
 [![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=InseeFr_Pogues&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=InseeFr_Pogues)
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=InseeFr_Pogues&metric=coverage)](https://sonarcloud.io/dashboard?id=InseeFr_Pogues)
 
+---
+
 The developer documentation can be found in the [doc](https://github.com/InseeFr/Pogues/tree/master/docs) folder and [browsed online](https://inseefr.github.io/Bowie/pogues).