clean up, refactor, documentation

- reducing amount of splitting in configs
- documenting configuration

tasks/pkgs/go.yml

@@ -1,4 +1,10 @@
 ---
+- ansible.builtin.include_vars:
+    file: go.yml
+    name: _go
+- ansible.builtin.set_fact:
+    pkgconfig.go: "{{ _go | ansible.builtin.combine(pkgconfig.go) }}"
+
 - name: append to pkgs
   set_fact:
     srcpkgs: "{{ srcpkgs + [ 'go' ] }}"