Update of dashboard banners according to Jessy's ask

Happy Holidays banner is replaced by TCO18 Stage 2 banner

Author: birdofpreyru

app/my-dashboard/notifications/notifications.jade

@@ -9,6 +9,6 @@
     it will have same width, you can create a new .banner-row if you want place more banners
     in a new row
   .banner-row
-    span.banner.tco17
+    a.banner.tco18(href="http://tco18.topcoder.com/",target="_blank",rel="noopener noreferrer")
     a.banner.watson(href="https://cognitive.topcoder.com/")
       img(src=require("../../../assets/images/logo_white.png"), alt="TCO17")

assets/css/my-dashboard/notifications.scss

@@ -39,13 +39,8 @@
     &:last-child{
       margin-right: 0;
     }
-    &.tco17{
-      background: url(../../images/happy-holidays.png) center/cover;
-      img{
-        width: 150px;
-        margin: 120px auto 0;
-        display: block;
-      }
+    &.tco18{
+      background: url(../../images/banner-tco18-stage-2.jpg) center/cover;
     }
     &.watson{
       background: url(../../images/banner-watson.jpg) center/cover;