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More icons are coming for new NTP features. Add a subdirectory for
them and move existing icons.

Bug: None
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I3424d626d01fad8383f4d04e733510563c3e959d
Reviewed-on: https://chromium-review.googlesource.com/1137031
Commit-Queue: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575288}