chore(guide): Update pages (#9372)

apps/guide/src/content/01-home/02-whats-new.mdx

@@ -0,0 +1,67 @@
+---
+title: What's new
+category: Home
+---
+
+# What's new
+
+<DiscordMessages rounded>
+	<DiscordMessage
+		interaction={{
+			author: {
+				avatar: '/assets/old-guide.png',
+				username: 'discord.js',
+			},
+			command: '/upgrade',
+		}}
+		author={{
+			avatar: '/assets/discordjs.png',
+			bot: true,
+			username: 'Guide Bot',
+			time: 'Today at 21:00',
+		}}
+	>
+		discord.js v14 has released and the guide has been updated!
+		<br />
+		This includes additions and changes made in Discord, such as slash commands and message components.
+	</DiscordMessage>
+</DiscordMessages>
+
+## Site
+
+We have moved from VuePress to [Next.js](https://nextjs.org/)! The source can be found [here](https://github.com/discordjs/discord.js/tree/main/apps/guide).
+
+## Pages
+
+All content has been updated to use discord.js v14 syntax. The v13 version of the guide can be found at https://v13.discordjs.guide.
+
+### New
+
+- [Updating from v13 to v14](/additional-info/changes-in-v14.md): A list of the changes from discord.js v13 to v14
+- [Slash commands](/interactions/slash-commands.md): Registering, replying to slash commands and permissions
+- [Buttons](/interactions/buttons.md): Building, sending, and receiving buttons
+- [Select menus](/interactions/select-menus.md): Building, sending, and receiving select menus
+- [Threads](/popular-topics/threads.md): Creating and managing threads
+- [Builders](/popular-topics/builders.md): A collection of builders to use with your bot
+
+### Updated
+
+- Commando: Replaced with [Sapphire](https://sapphirejs.dev/docs/Guide/getting-started/getting-started-with-sapphire)
+- [Voice](/voice/): Rewritten to use the [_`@discordjs/voice`_](https://github.com/discordjs/discord.js/tree/main/packages/voice) package
+- [Command handling](/creating-your-bot/command-handling.md/): Updated to use slash commands
+  - Obsolete sections removed
+- _`client.on('message')`_ snippets updated to _`client.on(Events.InteractionCreate)`_
+  - [Message content became a privileged intent on August 31, 2022](https://support-dev.discord.com/hc/articles/4404772028055)
+
+<DiscordMessages rounded>
+	<DiscordMessage
+		author={{
+			avatar: '/assets/discordjs.png',
+			bot: true,
+			username: 'Guide Bot',
+			time: 'Today at 21:00',
+		}}
+	>
+		Thank you to all of those that contributed to the development of discord.js and the guide!
+	</DiscordMessage>
+</DiscordMessages>