fix: add description for Studio (#64)

Author: yokishava

source/introduction/index.md

@@ -11,7 +11,7 @@ NodeX is building future where machines own their identity and exchange verifiab
 NodeX is an open-source toolkit that enables any developers to connect all devices and clouds, using features of decentralized identifiers as a basis of security and privacy. At a high level, the core components in NodeX are as follows;
 
 - **NodeX Agent**: An open-source Agent that integrates into devices.
-- **NodeX Hub**: A cloud access security broker that acts as an intermediary between devices and clouds.
+- **NodeX Studio**: An integrated monitoring tool that enables NodeX Agent to monitor integrated devices and aims to improve the efficiency of DevOps for IoT devices.
 - **NodeX Network**: A distributed network that operates public key certificates (DID Documents) of Agents.
 
 
@@ -32,24 +32,22 @@ An open-source Rust library that is extensible into any type of devices. Current
 - **Key Management with RoT**: This component supports generating key pairs within the device and protect private keys with hardware security module, such as TPM2.0, TrustZone, Secure Crypto Engine.
 - **Automated Provisioning**: This component supports registering and operating public key certificate (DID Document) generation, resolve, renewal, and revocation on a decentralized PKI without any IdPs, CAs, and intermediators.
 - **Policy Management**: This component allows security-relevant configuration changes through an authorized NodeX Hub. It has access policy file (IPs, DIDs, endpoints), security policy file (security parameter, pre-shared-key) and update policy (logging transmission frequency).
-- **E2E Secure Socket**: This component supports establishing a mutual authenticated channel with the Hub to exchange end-to-end authcrypt messages with clouds.
 - **RoT Extension**: This component can be applied to RoTs with proprietary specifications by implementing shared libraries according to the API specification.
 - **Device Extension**: This library can be distributed as middleware for IPC communication with client applications or as a library to be integrated into client application.
+- **Message Encryption/Decryption**: To enable encrypted messages to be sent and received between devices, NodeX Agent provides message encryption and decryption.
 
 For more information, see <a href="https://github.com/nodecross/nodex-agent" class="external" target="_blank" rel="noopener noreferrer">GitHub page</a>.
 
-### NodeX Hub
+### NodeX Studio
 
-A cloud access security broker consists of access broker, access control engine, access policy, inventory for secure communications between all devices and clouds. The core components are as follows;
+Integrated device monitoring tool that integrates NodeX Agent for device authentication, access policy management, Agent data logging and visualization.
 
 - **Device IAM**: This component supports device authentication based on digital signature scheme (256-bit ECDSA) rather than username and password.
-- **Device Authenticity**: This component supports verifying the device authenticity by message authentication code generated by the pre-shared secret between Agent and Hub.
+- **Device Authenticity**: This component supports verifying the device authenticity by message authentication code generated by the pre-shared secret between Agent and Studio.
 - **Inventory Management**: This component supports managing a configuration file which stores authorized device DIDs and attributions.
 - **Device Knowledge Database**: This component supports storing and real-time tracking device communication logs for vital checks and threat detection.
-- **E2E Message Routing**: This component supports relaying encrypted messages on a publish/subscribe model between Agents.
 - **Data Loss Prevention**: This component prevents devices from sending data or receiving data from unauthorized clouds by enforcing access policies.
 - **Dynamic Access Control**: This component supports dynamically changing access policies based on device's identity, location, and behavior to prevent spoofing and unauthorized access
-- **NodeX Studio**: User interface for operating the Hub supports launching a project and managing access policies and logging data of Agents.
 
 ### NodeX Network