ui-default: init

将ui-default合并至主存储库便于维护

packages/ui-default/pages/discussion_detail.page.styl

@@ -0,0 +1,20 @@
+.page--discussion_detail
+
+  .topic__content
+    margin: rem(20px 0)
+
+  .profile__bg
+    background-size: cover
+    background-position: center center
+    height: rem(60px)
+    margin-bottom: rem(-32px)
+
+  .sidebar-user-profile
+    .media__body
+      padding-left: rem(10px)
+      padding-top: rem(20px)
+
+    .user-profile-name
+      font-size: 1.2rem
+      color: #444
+      vertical-align: middle