move apps into pkgs and rename hosts

deploy/aws/variables.tf

@@ -0,0 +1,10 @@
+variable "ec2_size" {
+  type        = string
+  description = "Size of instance to launch"
+  default     = "t3a.small" # 2 GB RAM ($14/mo)
+}
+
+variable "images_bucket" {
+  description = "Name of the bucket in which to store the NixOS VM images."
+  type        = string
+}