docs: update references to gitter in favor of discord

Author: Adam Murray

content/guides/references/error-messages.md

@@ -117,8 +117,8 @@ correctly.
 If you are purposefully writing commands outside of a test, there is probably a
 better way to accomplish what you're trying to do. Read through the
 [Examples](/examples/examples/recipes),
-[chat with someone in our chat](https://gitter.im/cypress-io/cypress), or
-[open an issue](https://github.com/cypress-io/cypress/issues/new/choose).
+[chat with someone in our chat](https://discord.com/channels/755913899261296641/763114122065739818),
+or [open an issue](https://github.com/cypress-io/cypress/issues/new/choose).
 
 ### <Icon name="exclamation-triangle" color="red"></Icon> `cy...()` failed because the element you are chaining off of has become detached or removed from the dom
 

content/guides/references/troubleshooting.md

@@ -8,7 +8,8 @@ Cypress itself. In this situation, we recommend checking these support resources
 
 ## Support channels
 
-- Connect with our community in [Gitter](https://gitter.im/cypress-io/cypress)
+- Connect with our community in
+  [Discord](https://discord.com/channels/755913899261296641/763114122065739818)
 - Search existing [GitHub issues](https://github.com/cypress-io/cypress/issues)
 - Search this documentation (search is in the top right) 😉
 - Search [Stack Overflow](https://stackoverflow.com/questions/tagged/cypress)