docserverk - Add directions on how to run locally.
docserverk - Add directions on how to run locally.

Change-Id: I962ff80e33f08cf74918dd9d0ebec2110c8dd158
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/246817
Reviewed-by: Heather Miller <2e22000c5d22374561fe5fba576a31095b72dc2e@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot