cv: Fix directory links in the README.md
cv: Fix directory links in the README.md

Change-Id: I6a9fd8b720efc0d749912e969047fcf258562a3b
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/2424127
Reviewed-by: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@google.com>
Commit-Queue: Quinten Yearsley <747cf52e0cef2e3e9371802a2d344b6c87126a4b@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go