Update community links to Discord (graphql#1064)

Author: leebyron

src/content/community/Community-Developers.md

@@ -14,7 +14,8 @@ The following resources are intended to describe how GraphQL development process
 * The [GraphQL Specification](https://spec.graphql.org)
 * GraphQL [reference implementations and tools](/code/)
 * The official [GraphQL GitHub org](https://github.com/graphql)
-* The official [GraphQL Slack](https://slack.graphql.org)
+* The official [GraphQL Discord](https://discord.graphql.org)
+  * We're in the process of moving our official chat to Discord, but you may still find historical discussion at ~~the official [GraphQL Slack](https://slack.graphql.org)~~.
 * Instructions on how to sign the [GraphQL Specification Membership Agreement](https://github.com/graphql/graphql-wg/tree/HEAD/membership)
 * The [GraphQL project calendar](https://calendar.graphql.org)
 * Meeting replays on the [GraphQL YouTube channel](https://youtube.graphql.org)

src/content/community/Community-Resources.md

@@ -19,7 +19,8 @@ Please follow these channels for updates and information:
 
 * **Twitter:** [@graphql](https://twitter.com/graphql)
 * **GitHub:** [github.com/graphql](https://github.com/graphql)
-* **Slack:** [slack.graphql.org](https://slack.graphql.org) ([get an invite](https://slack-invite.graphql.org))
+* **Discord** [discord.graphql.org](https://discord.graphql.org)
+  * We're in the process of moving our official chat to Discord, but you may find historical discussion on ~~**Slack:** [slack.graphql.org](https://slack.graphql.org) ([get an invite](https://slack-invite.graphql.org))~~.
 * **Google Calendar:** [calendar.graphql.org](https://calendar.graphql.org)
 * **Blog:** [graphql.org/blog](/blog/)
 

src/content/community/Community-Users.md

@@ -26,20 +26,18 @@ Many members of the community use Stack Overflow to ask and answer questions. If
 
 [Read through the existing questions tagged with **graphql** or ask your own!](http://stackoverflow.com/questions/tagged/graphql)
 
-### Slack, Discord, and IRC
+### Live discussion
 
 Many GraphQL developers idle in Discord, Slack, and IRC for live
-communication and can answer quick questions. 
+communication and can answer quick questions.
 
 Please be patient and polite. These are not explicitly user support channels, although they're likely a good place to find someone who can answer your question if you ask nicely.
 
-* **Slack:** [#general on the GraphQL Slack](https://graphql.slack.com/messages/general/) [(Get an invite)](https://graphql-slack.herokuapp.com/)
-* **IRC:** [#graphql on freenode](https://freenode.net/)
-
-#### Discord
-
+* [GraphQL Foundation Discord](https://discord.graphql.org)
+  * We're in the process of moving our official chat to Discord, but you may find historical discussion in ~~[#general on the GraphQL Slack](https://graphql.slack.com/messages/general/) [(Get an invite)](https://graphql-slack.herokuapp.com/)~~.
 * [Everything GraphQL: Curated By The Guild](https://discord.gg/xud7bH9)
-* [#graphql on the ReactiFlux Discord](http://join.reactiflux.com/)
+* [#help-graphql on the ReactiFlux Discord](http://join.reactiflux.com/)
+* [#graphql on freenode IRC](https://freenode.net/)
 
 ### Vendor channels