reorganizing configuration

- static package configuration in `vars/pkgs`
  - loaded into the variable `pkgconfig` as part of `tasks/main.yml`

tasks/config/air.yml

@@ -0,0 +1,7 @@
+# vim: set filetype=yaml.ansible :
+---
+- name: Set configuration for air
+  ansible.builtin.set_fact:
+    air:
+      ver: "{{ pkgconfig.air.version }}"
+      pkg: "{{ pkgconfig.air.git_repo }}@{{ pkgconfig.air.version }}"