Drop insecure '-k' flag from curl

backup-codimd-docs.sh

build-and-benchmark-py-project.sh

build-and-test-py-project-within-miniconda.sh

build-and-test-py-project.sh

build-docs.sh

build-py-project-and-run-examples.sh

build-py-project-within-miniconda.sh

build-py-project.sh

ci-support.sh

prepare-and-run-flake8.sh

prepare-and-run-pylint.sh

run-examples.sh