mail: Add goimapnotify configuration template

Runs neomutt-syncmail on new mail. Only comes with an 'example' service
which needs to be replaced by the actual connection details.

office/.config/goimapnotify/goimapnotify.yaml

@@ -0,0 +1,10 @@
+configurations:
+  - host: imap.example.com
+    port: 993
+    tls: true
+    tlsOptions:
+      starttls: false
+    boxes:
+      - mailbox: INBOX
+        onNewMail: neomutt-syncmail purelymail-inbox
+        onNewMailPost: 'notify-send "Incoming mail"'