restructuring for easier maintenance

- creating src packages when things can't be installed via
  actual system package
- neovim srcpkg is being worked on now

tasks/pkgs/Debian/zig.yml

@@ -0,0 +1,4 @@
+---
+- name: add zig to srcpkgs
+  ansible.builtin.set_fact:
+    srcpkgs: "{{ srcpkgs + [ 'zig' ] }}"