chore: move header files to includes folder

include/NetworkManager.h

@@ -0,0 +1,12 @@
+#pragma once
+#include "NodeContext.h"
+#include <ESP8266WiFi.h>
+
+class NetworkManager {
+public:
+    NetworkManager(NodeContext& ctx);
+    void setupWiFi();
+    void setHostnameFromMac();
+private:
+    NodeContext& ctx;
+};