ref(builder): remove volume definition in Dockerfile

This was missed in #1917.
docs(deisctl): clarify deisctl version when using install.sh
Merge pull request #1991 from carmstrong/clarify_deisctl_link

docs(deisctl): clarify deisctl version when using install.sh
Merge pull request #1984 from carmstrong/remove_builder_volume

ref(builder): remove volume definition in Dockerfile