Add ECH Discord Channel to EIP Page Index (ethereum#5415)

* Add ECH Discord Channel to EIP Page Index

* Update index.html

Co-authored-by: Pandapip1 <45835846+Pandapip1@users.noreply.github.com>

* Update index.html

Co-authored-by: Pandapip1 <45835846+Pandapip1@users.noreply.github.com>

index.html

@@ -4,6 +4,7 @@
 ---
 
 <h1 class="page-heading">EIPs
+  <a href="https://discord.io/EthCatHerders"><img src="https://dcbadge.vercel.app/api/server/Nz6rtfJ8Cu?style=flat" alt="Discord"></a>
   <a href="/last-call.xml"><img src="https://img.shields.io/badge/rss-Last Calls-red.svg" alt="RSS"></a>
 </h1>
 <p>Ethereum Improvement Proposals (EIPs) describe standards for the Ethereum platform, including core protocol specifications, client APIs, and contract standards. Network upgrades are discussed separately in the <a target="_blank" href="https://github.com/ethereum/pm/">Ethereum Project Management</a> repository.</p>