chore: update configuration for output and distribution

data/urls.tsx

@@ -1,18 +1,18 @@
 export const websites = [
   {
-    icon: "./gitea.svg",
+    icon: "./img/gitea.svg",
     title: "Gitea",
     description: "实验室 Git 服务。",
     link: "https://git.intcplab.cn",
   },
   {
-    icon: "./bbs.svg",
+    icon: "./img/bbs.svg",
     title: "实验室论坛",
     description: "只是一个假的论坛。",
     link: "https://website2.example.com",
   },
   {
-    icon: "./unknow.svg",
+    icon: "./img/unknow.svg",
     title: "挑战赛排行榜",
     description: "机器学习课程配套挑战赛排行榜。",
     link: "https://rank.intcplab.cn",