caddy: fmt, improve comments

Caddyfile

@@ -1,9 +1,17 @@
+# global options
 {
-  # acme_ca https://acme-staging-v02.api.letsencrypt.org/directory
-  # no logging policy, don't log anything
-  log {
-    output discard
-  }
+        # remove comment to use staging Let's Encrypt servers (for testing)
+        # acme_ca https://acme-staging-v02.api.letsencrypt.org/directory
+
+        # auto_https contact mail address, for TLS certs notifications (expiry,
+        # other problems with certs)
+        email admins@pub.solar
+
+        # default to no-logs-policy, don't log anything
+        # comment this block out for debugging
+        log {
+                output discard
+        }
 }
 
 # static file server
@@ -11,4 +19,8 @@ miom.space {
         root * /srv/miom.space
         file_server
 }
+
+# redirect www. subdomain to apex (root) domain
+www.miom.space {
+        redir https://miom.space{uri}
 }