project-lakitu: Remove dead docker symlink

BUG=b/176912333
TEST=presubmit
RELEASE_NOTE=None

Change-Id: Icc050dc75a782e114aa96522dd87d6c122bef4ce
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/10860
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
diff --git a/project-lakitu/app-emulation/docker/docker-19.03.13-r3.ebuild b/project-lakitu/app-emulation/docker/docker-19.03.13-r3.ebuild
deleted file mode 120000
index 2dee3ba..0000000
--- a/project-lakitu/app-emulation/docker/docker-19.03.13-r3.ebuild
+++ /dev/null
@@ -1 +0,0 @@
-docker-19.03.13.ebuild
\ No newline at end of file