update readme

README.md

@@ -12,7 +12,7 @@
 [![License](https://img.shields.io/github/license/AcalaNetwork/Acala?color=green)](https://github.com/AcalaNetwork/Acala/blob/master/LICENSE)
  <br />
 [![Twitter URL](https://img.shields.io/twitter/url?style=social&url=https%3A%2F%2Ftwitter.com%2FAcalaNetwork)](https://twitter.com/AcalaNetwork)
-[![Discord](https://img.shields.io/badge/Discord-gray?logo=discord)](https://www.acala.gg/)
+[![Discord](https://img.shields.io/badge/Discord-gray?logo=discord)](https://discord.gg/xZfRD6rVfJ)
 [![Telegram](https://img.shields.io/badge/Telegram-gray?logo=telegram)](https://t.me/AcalaOfficial)
 [![Discourse](https://img.shields.io/badge/Forum-gray?logo=discourse)](https://acala.discourse.group/)
 [![Medium](https://img.shields.io/badge/Medium-gray?logo=medium)](https://medium.com/acalanetwork)
@@ -23,26 +23,26 @@
 
 - [1. Introduction](#1-introduction)
 - [2. Overview](#2-overview)
-  - [2.1. aUSD and the Honzon stablecoin protocol](#21-ausd-and-the-honzon-stablecoin-protocol)
-  - [2.2. Acala Network Economic Model](#22-acala-network-economic-model)
+	- [2.1. aUSD and the Honzon stablecoin protocol](#21-ausd-and-the-honzon-stablecoin-protocol)
+	- [2.2. Acala Network Economic Model](#22-acala-network-economic-model)
 - [3. Building](#3-building)
-  - [NOTE](#note)
+	- [NOTE](#note)
 - [4. Run](#4-run)
 - [5. Development](#5-development)
 - [6. Bug Bounty :bug:](#6-bug-bounty-bug)
 - [7. Bench Bot](#7-bench-bot)
-  - [Generate module weights](#generate-module-weights)
-  - [Generate runtime weights](#generate-runtime-weights)
-  - [Bench Acala EVM+](#bench-acala-evm)
+	- [Generate module weights](#generate-module-weights)
+	- [Generate runtime weights](#generate-runtime-weights)
+	- [Bench Acala EVM+](#bench-acala-evm)
 - [8. Migration testing runtime](#8-migration-testing-runtime)
-  - [Try testing runtime](#try-testing-runtime)
+	- [Try testing runtime](#try-testing-runtime)
 - [9. Run local testnet with parachain-launch](#9-run-local-testnet-with-parachain-launch)
 - [10. Build For Release](#10-build-for-release)
 - [11. Setup Local EVM+ Test Environment](#11-setup-local-evm-test-environment)
-  - [Setting up local node](#setting-up-local-node)
-      - [Compile the node from source code:](#compile-the-node-from-source-code)
-      - [Run node using docker:](#run-node-using-docker)
-  - [Setting up eth-rpc-adapter](#setting-up-eth-rpc-adapter)
+	- [Setting up local node](#setting-up-local-node)
+			- [Compile the node from source code:](#compile-the-node-from-source-code)
+			- [Run node using docker:](#run-node-using-docker)
+	- [Setting up eth-rpc-adapter](#setting-up-eth-rpc-adapter)
 
 <!-- /TOC -->