Button to remove DNS server

Added button to remove DNS server from
Nameservers list.

Resolves openbmc/phosphor-webui#11

Tested: Added and was able to remove DNS servers
  from list. Page updated appropriately.

Change-Id: I64e9d2499465f1aa5f9f34c831961578abf32b2b
Signed-off-by: beccabroek <beccabroek@gmail.com>
diff --git a/app/configuration/styles/network.scss b/app/configuration/styles/network.scss
index 26653fd..db32e98 100644
--- a/app/configuration/styles/network.scss
+++ b/app/configuration/styles/network.scss
@@ -47,4 +47,13 @@
   {
     margin-left: 3em;
   }
+  .dns__server-remove {
+    color: $medblue;
+    height: 2.1em;
+    opacity: 1;
+    margin-left: 1em;
+    &:hover {
+      cursor: pointer;
+    }
+  }
 }