refactor: remove default cover from user profile page (#881)

#### What type of PR is this?

/kind improvement

#### What this PR does / why we need it:

因为暂时不太好为用户设置个人资料背景图片，所以暂时移除个人资料页面的默认背景。

#### Which issue(s) this PR fixes:

Fixes https://github.com/halo-dev/halo/issues/2851

#### Screenshots:

<img width="1680" alt="image" src="https://user-images.githubusercontent.com/21301288/220852412-6732c965-ae43-441e-b99a-af3d6d978d4f.png">


#### Special notes for your reviewer:

None

#### Does this PR introduce a user-facing change?

```release-note
移除 Console 端个人资料页面的默认背景图片
```

src/modules/system/users/layouts/UserProfileLayout.vue

@@ -1,13 +1,7 @@
 <script lang="ts" setup>
 import BasicLayout from "@/layouts/BasicLayout.vue";
 import { apiClient } from "@/utils/api-client";
-import {
-  IconUpload,
-  VButton,
-  VSpace,
-  VTabbar,
-  VAvatar,
-} from "@halo-dev/components";
+import { VButton, VSpace, VTabbar, VAvatar } from "@halo-dev/components";
 import { computed, onMounted, provide, ref, watch } from "vue";
 import { useRoute, useRouter } from "vue-router";
 import type { User } from "@halo-dev/api-client";
@@ -33,6 +27,7 @@ const tabs = [
 ];
 
 const user = ref<User>();
+const loading = ref();
 const editingModal = ref(false);
 const passwordChangeModal = ref(false);
 
@@ -40,6 +35,7 @@ const { params } = useRoute();
 
 const handleFetchUser = async () => {
   try {
+    loading.value = true;
     if (params.name === "-") {
       const { data } = await apiClient.user.getCurrentUserDetail();
       user.value = data;
@@ -51,6 +47,8 @@ const handleFetchUser = async () => {
     }
   } catch (e) {
     console.error(e);
+  } finally {
+    loading.value = false;
   }
 };
 
@@ -103,37 +101,33 @@ const handleTabChange = (id: string) => {
       @close="handleFetchUser"
     />
     <header class="bg-white">
-      <div class="h-48 bg-gradient-to-r from-gray-800 to-red-500"></div>
-      <div class="px-4">
-        <div class="-mt-12 flex items-end space-x-5 sm:-mt-16">
-          <div v-if="user?.spec?.avatar" class="inline-flex items-center">
-            <div class="h-24 w-24 sm:h-32 sm:w-32">
+      <div class="p-4">
+        <div class="flex items-center justify-between">
+          <div class="flex flex-row items-center gap-5">
+            <div class="h-20 w-20">
               <VAvatar
-                :src="user?.spec?.avatar"
-                :alt="user?.spec?.displayName"
+                v-if="user"
+                :src="user?.spec.avatar"
+                :alt="user?.spec.displayName"
                 circle
                 width="100%"
                 height="100%"
-                class="ring-4 ring-white drop-shadow-lg"
+                class="ring-4 ring-white drop-shadow-md"
               />
             </div>
-          </div>
-          <div
-            class="mt-6 sm:flex sm:min-w-0 sm:flex-1 sm:items-center sm:justify-end sm:space-x-6 sm:pb-1"
-            :class="{ '!mt-12': !user?.spec?.avatar }"
-          >
-            <div class="mt-6 block min-w-0 flex-1">
-              <h1 class="truncate text-xl font-bold text-gray-900">
-                <span class="mr-1">{{ user?.spec?.displayName }}</span>
+            <div class="block">
+              <h1 class="truncate text-lg font-bold text-gray-900">
+                {{ user?.spec.displayName }}
               </h1>
-              <h2 class="text-gray-600">@{{ user?.metadata.name }}</h2>
+              <span v-if="!loading" class="text-sm text-gray-600">
+                @{{ user?.metadata.name }}
+              </span>
+            </div>
           </div>
           <div
             v-if="
-                currentUserHasPermission(['system:users:manage']) ||
-                isCurrentUser
+              currentUserHasPermission(['system:users:manage']) || isCurrentUser
             "
-              class="justify-stretch mt-6 hidden flex-col space-y-3 sm:flex-row sm:space-y-0 sm:space-x-4 md:flex"
           >
             <FloatingDropdown>
               <VButton type="default">编辑</VButton>
@@ -162,13 +156,6 @@ const handleTabChange = (id: string) => {
           </div>
         </div>
       </div>
-      </div>
-
-      <div class="absolute top-6 right-6">
-        <div class="">
-          <IconUpload v-if="false" class="text-white" />
-        </div>
-      </div>
     </header>
     <section class="bg-white p-4">
       <VTabbar