Refacted by moving variable declarations into distinct per-app files under 'options' subdirectory

roles/bootstrap/defaults/main/general.yml

@@ -1,16 +1,11 @@
 ---
+# defaults file for bootstrap
 admins: ~
 guests: ~
 users: ~
 roots: ~
-pubkeys: ~
-root_acct: ~
-nonlogin_method: ~
-extra_packages: ~
-official_name: ~
-official_email: ~
-gpg_sign_id: ~
-homedir: ~
-cimages: ~
 enrollment_key: ~
-gcfs_password: ~
+gcfs_password: ~
+gpg_sign_id: ~
+official_name: ~
+official_email: ~