Merge branch 'hotfix/accessibility-focus' into 'dev'

no focus except firefox

See merge request web-et-numerique/llle_project/ecolyo!353

src/components/App.tsx

@@ -34,7 +34,7 @@ export const App = () => {
               <TutorialWelcome open={!tutorial.isWelcomeSeen} />
               <Navbar />
               <Main>
-                <Content className="app-content" tabIndex="-1">
+                <Content className="app-content">
                   <Routes />
                 </Content>
               </Main>