chore: switch chat links to slack (#2782)

website/content/docs/contributor-guide.md

@@ -29,7 +29,7 @@ If you are able to offer up a change to existing content, we welcome this. Once
 While we work on building this page (and you can help!), here are some links with more information about getting involved:
 
 * [Setup instructions and Contribution Guidelines](https://github.com/netlify/netlify-cms/blob/master/CONTRIBUTING.md)
-* [Join us on Gitter](https://gitter.im/netlify/NetlifyCMS)
+* [Join our Community Chat](https://netlifycms.org/chat)
 * [Code of Conduct](https://github.com/netlify/netlify-cms/blob/master/CODE_OF_CONDUCT.md)
 * [Project Milestones](https://github.com/netlify/netlify-cms/milestones)
 * [Good First Issues](https://github.com/netlify/netlify-cms/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3A%22good+first+issue%22+-label%3Aclaimed)

website/content/docs/intro.md

@@ -34,5 +34,5 @@ If you hook up Netlify CMS to your website, you're basically adding a tool for c
 - Get a feel for the UI in the [demo site](https://cms-demo.netlify.com). (No login required. Click the login button to go straight to the CMS editor UI.)
 - [Start with a template](../start-with-a-template/) to make a Netlify CMS-enabled site of your own.
 - Configure your existing site by following a [tutorial](../add-to-your-site/) or checking [configuration options](../configuration-options).
-- Ask questions and share ideas in the Netlify CMS community on [Gitter](https://gitter.im/netlify/netlifycms).
+- Ask questions and share ideas in the Netlify CMS [community chat](https://netlifycms.org/chat).
 - Get involved in new developments and become a [contributor](../contributor-guide/).