[docs] Use Discord over Gitter (mui#33)

README.md

@@ -10,7 +10,7 @@ that you can use to tag your questions.
 [![npm package](https://img.shields.io/npm/v/@material-next/core.svg)](https://www.npmjs.org/package/@material-next/core)
 ![npm](https://img.shields.io/npm/dm/@material-next/core.svg)
 [![CircleCI](https://img.shields.io/circleci/project/github/material-next/material-next/master.svg)](https://circleci.com/gh/material-next/material-next/tree/master)
-[![Gitter](https://img.shields.io/badge/gitter-join%20chat-f81a65.svg)](https://gitter.im/material-next/material-next?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Chat](https://img.shields.io/badge/chat-on%20discord-7289da.svg)](https://discord.gg/MwT5uvA)
 [![Coverage Status](https://img.shields.io/codecov/c/github/material-next/material-next/master.svg)](https://codecov.io/gh/material-next/material-next/branch/master)
 
 [![PeerDependencies](https://img.shields.io/david/peer/material-next/material-next.svg)](https://david-dm.org/material-next/material-next#info=peerDependencies&view=list)

SUPPORT.md

@@ -2,7 +2,7 @@
 
 ## Asking Questions
 
-For how-to questions and other non-issues, please use [StackOverflow](http://stackoverflow.com/questions/tagged/material-next) or [Gitter](https://gitter.im/material-next/material-next) chat instead of Github issues. There is a StackOverflow tag called "material-next" that you can use to tag your questions.
+For how-to questions and other non-issues, please use [StackOverflow](http://stackoverflow.com/questions/tagged/material-next) or [Discord](https://discord.gg/MwT5uvA) chat instead of Github issues. There is a StackOverflow tag called "material-next" that you can use to tag your questions.
 
 ## Opening an Issue
 

docs/src/pages/discover-more/community.md

@@ -2,7 +2,7 @@
 
 If you want to stay up to date on the development of Material-Next or to reach out to the community, you can follow those resources:
 
-- Chat with us on [Gitter]().
+- Chat with us on [Discord](https://discord.gg/MwT5uvA).
 - For help using Material-Next, ask on StackOverflow using the tag
 [material-next](http://stackoverflow.com/questions/tagged/material-next).
 - Follow [@MaterialNext](https://twitter.com/MaterialNext) on Twitter.

docs/src/pages/getting-started/frequently-asked-questions.md

@@ -2,7 +2,7 @@
 
 Stuck on a particular problem? Check some of these common gotchas first.
 
-If you still can't find what you're looking for, you can ask the community in [gitter](https://gitter.im/material-next/material-next).
+If you still can't find what you're looking for, you can ask the community on [Discord](https://discord.gg/MwT5uvA).
 For how-to questions and other non-issues, please use [StackOverflow](https://stackoverflow.com/questions/tagged/material-next) instead of Github issues. There is a StackOverflow tag called `material-next` that you can use to tag your questions.
 
 ## Why do the fixed positioned elements move when a modal is opened?