Use of deprecated coursier -I option in scripts

[hmf]

Scripts calling coursier to generate the launcher and install the kernel are using the deprecated -I option.

Do we still need this? If not, create a PR with its removal?

[alexarchambault]

-i and -I are indeed deprecated. --shared should be used instead. For example, this

-i user -I user:sh.almond:scala-kernel-api_${SCALA_FULL_VERSION}:${ALMOND_VERSION}

should become

--shared sh.almond:scala-kernel-api_${SCALA_FULL_VERSION}