Replace run.sh with an equivalent ansible.cfg

I've learned some more about Ansible, and how to use `ansible.cfg` to
set up `ansible-playbook` to do the same thing as our `run.sh` was
doing! Same number of files, less overhead for the workflow's weirdness.

README.md

@@ -18,9 +18,9 @@ these are all very basic commands, captured in script form for convenience!)
 - `setup-plausible.yml`: Sets up the Plausible server itself, as a `systemd`
   service running Plausible's official Docker container.
 
-You can run them individually, or all at once, with `run.sh`:
+You can run them individually, or all at once, with `ansible-playbook`:
 
-    run.sh setup-all.yml
+    ansible-playbook setup-all.yml
 
 If you're interested in setting up your own Plausible service, this could be
 useful as a starting point, there's not much custom here! Just a couple things

ansible.cfg

@@ -0,0 +1,5 @@
+[defaults]
+inventory = inventory.cfg
+
+[privilege_escalation]
+become_ask_pass = True

run.sh

@@ -1 +0,0 @@
-ansible-playbook -i inventory.cfg --ask-become-pass $@