set version 23.04 and replaced style with class h-150

uitwww/templates/pages/index.html

@@ -28,7 +28,7 @@ Home page
 	<div class="row background-wallpaper banner-latest p-100">
 		<div class="col text-center">
 			<h1>
-				Ubuntu 22.04
+				Ubuntu 23.04
 			</h1>
 			<p class="intro text-center">
 				Le ultime novità dal mondo del software libero, con stile.
@@ -136,13 +136,13 @@ Home page
 				<div class="col text-center">
 					<a href="https://www.infomaniak.com/it">
 						<img src="{{ url_for('static', filename='images/sponsor/infomaniak.png')}}"
-							 style="height:150px;" alt="infomaniak logo"/>
+							 class="h-150" alt="infomaniak logo"/>
 					</a>
 				</div>
 				<div class="col text-center">
 					<a href="https://www.top-ix.org/it/home/">
 						<img src="{{ url_for('static', filename='images/sponsor/topix-logo.png')}}"
-							 style="height:150px;" alt="Top-ix logo"/>
+							 class="h-150" alt="Top-ix logo"/>
 					</a>
 				</div>
 			</div>