Squashed: "Improve CI template organization"

.gitlab-industrial-ci-kinetic-no-rosinstall.yml

.gitlab-industrial-ci-kinetic-with-rosinstall.yml

README.adoc

ci-templates/README.adoc

ci-templates/auto-rules/kinetic-default.yml

ci-templates/auto-rules/melodic-default.yml

ci-templates/auto-rules/no-default.yml

ci-templates/auto-rules/noetic-default.yml

ci-templates/auto-rules/with-rosinstall/kinetic-default.yml

ci-templates/auto-rules/with-rosinstall/melodic-default.yml

ci-templates/auto-rules/with-rosinstall/no-default.yml

ci-templates/auto-rules/with-rosinstall/noetic-default.yml

ci-templates/core.yml

ci-templates/examples/build_vars.yml

ci-templates/examples/manual_job.yml

ci-templates/examples/simple_include.yml

ci-templates/industrial-ci-templates.yml

ci-templates/syntax-check.yml