add symlink helper

- symlinking is done often enough that it makes sense to have a helper
for it
- move appimage and archive helpers to use symlink helper
- fix formatting of air and alacritty

tasks/pkgs/air.yml

@@ -17,7 +17,7 @@
       ansible.builtin.set_fact:
         air_install_method: "{{ install_method if install_method in air_install_methods else air_install_methods[0] }}"
 
-    - name: Configure air source install
+    - name: Set air build facts
       when:
         - air_install_method == 'source'
       block: