Replace pihole with adguardhome

AGH is much simpler to install and manage, and does DoH natively.

ansible/roles/adguardhome/tasks/main.yml

@@ -0,0 +1,17 @@
+- name: Include vault
+  include_vars: vault.yml
+
+- name: Install adguardhome
+  kewlfft.aur.aur:
+    name: adguardhome-bin
+  become: true
+
+- name: Install config file
+  template:
+    src: files/adguardhome.yml
+    dest: /var/lib/adguardhome/AdGuardHome.yaml
+    validate: /var/lib/adguardhome/AdGuardHome --check-config --config %s
+    owner: root
+    mode: "0600"
+  notify: restart adguardhome
+  become: true