docs: update README.md (ipfs#4307)

Removes out of date link

Author: parthshah1

packages/ipfs-http-client/README.md

@@ -67,7 +67,6 @@ Loading this module through a script tag will make it's exports available as `Ip
 <p align="center">
   <a href="https://riot.im/app/#/room/#ipfs-dev:matrix.org"><img src="https://img.shields.io/badge/matrix-%23ipfs%3Amatrix.org-blue.svg?style=flat" /> </a>
   <a href="http://webchat.freenode.net/?channels=%23ipfs"><img src="https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat" /></a>
-  <a href="https://discord.gg/24fmuwR"><img src="https://img.shields.io/discord/475789330380488707?color=blueviolet&label=discord&style=flat" /></a>
   <a href="https://github.com/ipfs/team-mgmt/blob/master/MGMT_JS_CORE_DEV.md"><img src="https://img.shields.io/badge/team-mgmt-blue.svg?style=flat" /></a>
 </p>