Implement create/delete for Helm releases

cmd/tk/create_helmrelease.go

cmd/tk/delete_helmrelease.go

cmd/tk/utils.go

docs/cmd/tk_create.md

docs/cmd/tk_create_helmrelease.md

docs/cmd/tk_delete.md

docs/cmd/tk_delete_helmrelease.md

go.mod

mkdocs.yml