fix: avoid cropping logo in about&new slideshow

Signed-off-by: Salvatore Martire <4652631+salmart-dev@users.noreply.github.com>

Author: salmart-dev

src/components/SlideShow.vue

@@ -221,7 +221,7 @@ function goToPage(pageId: string) {
 	background-image: var(--image-logoheader, var(--image-logo, v-bind(cssLogoUrl)));
 	background-repeat: no-repeat;
 	background-position: center;
-	background-size: 100px;
+	background-size: contain;
 	margin: auto;
 	position: absolute;
 	left: 0;