enhance(frontend): 各サーバーはMisskeyを利用したサービスであることを強調 (#13559)

* ロゴ周りを追加

* 調整

---------

Co-authored-by: uboar <10250330+uboar@users.noreply.github.com>

packages/frontend/src/pages/welcome.entrance.a.vue

@@ -9,7 +9,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<XTimeline class="tl"/>
 	<div class="shape1"></div>
 	<div class="shape2"></div>
+	<div class="logo-wrapper">
+		<div class="powered-by">Powered by</div>
 		<img :src="misskeysvg" class="misskey"/>
+	</div>
 	<div class="emojis">
 		<MkEmoji :normal="true" :noStyle="true" emoji="👍"/>
 		<MkEmoji :normal="true" :noStyle="true" emoji="❤"/>
@@ -113,16 +116,26 @@ misskeyApiGet('federation/instances', {
 		opacity: 0.5;
 	}
 
-	> .misskey {
+	> .logo-wrapper {
 		position: fixed;
-		top: 42px;
-		left: 42px;
-		width: 140px;
+		top: 36px;
+		left: 36px;
+		flex: auto;
+		color: #fff;
+		user-select: none;
+		pointer-events: none;
 
+		> .powered-by {
+			margin-bottom: 2px;
+		}
+
+		> .misskey {
+			width: 140px;
 			@media (max-width: 450px) {
 				width: 130px;
 			}
 		}
+	}
 
 	> .emojis {
 		position: fixed;