doc: remove Gitter badge from README

Remove the Gitter badge.

Gitter is not supported by us. We use IRC channels on Freenode. Having
the Gitter badge is confusing because we list different resources
later in the doc and never mention Gitter.

PR-URL: #13231
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Gibson Fahnestock <[email protected]>
Reviewed-By: Daijiro Wachi <[email protected]>
Reviewed-By: Roman Reiss <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>

Author: Trott

README.md

@@ -4,7 +4,6 @@
   </a>
 </p>
 <p align="center">
-  <a title="Gitter" href="https://gitter.im/nodejs/node?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge"><img src="https://badges.gitter.im/Join%20Chat.svg"></a>
   <a title="CII Best Practices" href="https://bestpractices.coreinfrastructure.org/projects/29"><img src="https://bestpractices.coreinfrastructure.org/projects/29/badge"></a>
 </p>