netlog_viewer/README.md: Re-order with user-focused sections at top.
netlog_viewer/README.md: Re-order with user-focused sections at top.

Change-Id: I275ab632b449623a2de51d3645a2045b6c91b3c6
Reviewed-on: https://chromium-review.googlesource.com/1229334
Commit-Queue: Matt Mueller <df5c91f9a303512cf04e7877651444295be288b1@chromium.org>
Reviewed-by: Eric Roman <0ff3f513126b8ac069086ab3362de387f0f0f6a5@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult