rename almost all mentions of kargo

.github/ISSUE_TEMPLATE.md

README.md

RELEASE.md

contrib/aws_inventory/kubespray-aws-inventory.py

contrib/azurerm/README.md

contrib/network-storage/glusterfs/README.md

contrib/terraform/aws/README.md

contrib/terraform/aws/create-infrastructure.tf

contrib/terraform/aws/docs/aws_kubespray.png

docs/ansible.md

docs/aws.md

docs/calico.md

docs/comparisons.md

docs/dns-stack.md

docs/downloads.md

docs/figures/kubespray-calico-rr.png

docs/getting-started.md

docs/ha-mode.md

docs/netcheck.md

docs/roadmap.md