docs(deploy): document PV/UV stats and real client IP via nginx realip

config.example.json

@@ -30,7 +30,25 @@
     "host": "127.0.0.1",
     "port": 8080,
     "auth_token": "replace-with-a-long-random-token",
-    "public_base_url": ""
+    "public_base_url": "",
+    "track": {
+      "enabled": true,
+      "header_order": ["X-Real-IP", "X-Forwarded-For"],
+      "trusted_proxies": [
+        "127.0.0.0/8",
+        "::1/128",
+        "10.0.0.0/8",
+        "172.16.0.0/12",
+        "192.168.0.0/16",
+        "169.254.0.0/16",
+        "fc00::/7",
+        "fe80::/10"
+      ],
+      "count_bots": false,
+      "flush_seconds": 60,
+      "keep_days": 180,
+      "max_hits_per_ip_path_per_day": 0
+    }
   },
   "storage": {
     "database_path": "data/app.db",