*: Remove remaining tectonic-torcx references

These should have been removed by 45fa0e49 (*: remove
k8s-node-bootstrap.service, 2018-06-08,
coreos/tectonic-installer#3275).

Documentation/dev/node-bootstrap-flow.md

@@ -33,8 +33,6 @@ Additionally, only on one of the master nodes the following kubernetes bootstrap
 * `bootkube.service` deploys the initial bootstrapping control-plane. It is started only after `kubelet.service` _is started_. It is a oneshot unit and cannot crash, and it runs only during bootstrap
 * `tectonic.service` deploys tectonic control-plane. It is started only after `bootkube.service` _has completed_.  It is a oneshot unit and cannot crash, and it runs only during bootstrap
 
-[tectonic-torcx]: https://github.com/coreos/tectonic-torcx
-
 ## Service ordering
 
 Service ordering is enforced via systemd dependencies. This is the rationale for the settings, with relevant snippets:

modules/ignition/variables.tf

@@ -45,12 +45,6 @@ variable "cloud_provider_config" {
   default     = ""
 }
 
-variable "torcx_store_url" {
-  type        = "string"
-  description = "(optional) URL template for torcx store. Leave empty to use the default CoreOS endpoint."
-  default     = ""
-}
-
 variable "etcd_count" {
   type    = "string"
   default = 0