feat: update main page and add padding

fix: wrong width

data/contacts.tsx

@@ -1,19 +1,19 @@
 export const contacts = [
   {
     name: "张三",
-    describe: "实验室主任",
+    describe: "实验室主任，不会你以为真的就叫这个名字吧？不会吧不会吧？",
     email: "zhangsan@example.com",
     phone: "1234567890",
   },
   {
     name: "李四",
-    describe: "实验室副主任",
+    describe: "实验室副主任。这仅仅只是示例数据，实际上也只能阿巴阿巴。",
     email: "lisi@example.com",
     qq: "1234567890",
   },
   {
     name: "王五",
-    describe: "实验室秘书",
+    describe: "实验室秘书。假的，全是假的！",
     email: "wangwu@example.com",
     qq: "1234567890",
     phone: "1234567890",

data/urls.tsx

@@ -5,11 +5,17 @@ export const websites = [
     description: "实验室 Git 服务。",
     link: "https://git.intcplab.cn",
   },
+  {
+    icon: "./img/gitea.svg",
+    title: "机器学习课程",
+    description: "机器学习课程的配套资源。",
+    link: "https://git.intcplab.cn/yuhuapeng/Machine-Learning-in-Python",
+  },
   {
     icon: "./img/bbs.svg",
     title: "实验室论坛",
     description: "只是一个假的论坛。",
-    link: "https://website2.example.com",
+    link: "https://bbs.intcplab.cn",
   },
   {
     icon: "./img/unknow.svg",