Website / Documentation - Slack to Discord (#2200)

* change slack to discord in footer

* change Slack to Discord in community guideline

website/docusaurus.config.js

@@ -225,12 +225,8 @@ module.exports = async function configCreatorAsync() {
                   href: "https://twitter.com/wailsapp",
                 },
                 {
-                  label: "Slack",
-                  href: "https://gophers.slack.com/messages/CJ4P9F7MZ/",
-                },
-                {
-                  label: "Slack invite",
-                  href: "https://invite.slack.golangbridge.org/",
+                  label: "Discord",
+                  href: "https://discord.gg/JDdSxwjhGf",
                 },
               ],
             },

website/src/pages/community-guide.mdx

@@ -15,7 +15,7 @@ This [Code of Conduct](./coc) is an easy guide to develop the technical communit
 ### Get Support
 
 - [GitHub](https://github.com/wailsapp/wails) - If you have a bug to report or feature to request, that's what the GitHub issues are for. Please respect the rules specified in each repository's issue template.
-- [Slack](https://gophers.slack.com/messages/CJ4P9F7MZ/) - A place for Wails devs to meet and chat in real time.
+- [Discord](https://discord.gg/JDdSxwjhGf) - A place for Wails devs to meet and chat in real time.
 - [QQ Group(中文)](https://qm.qq.com/cgi-bin/qm/qr?k=PmIURne5hFGNd7QWzW5qd6FV-INEjNJv&jump_from=webapi) - A Wails group for Chinese developers to communicate, where you can get help from other developers.
 
 ### Explore the Ecosystem