chore(adventure): Remove unmaintained community library links

Author: kezz

src/content/docs/adventure/community-libraries.mdx

@@ -28,7 +28,6 @@ They typically have no dependencies on a specific platform, just Adventure and p
 {/* spellchecker:off */}
 Name                        | Description                                                           | Link
 ----------------------------|-----------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------
-adventure-binary-serializer | Serializer for converting to packed bytes                             | [Moulberry/adventure-binary-serializer](https://github.com/Moulberry/adventure-binary-serializer)
 EnhancedLegacyText          | Alternative input format that is legacy compatible with new features  | [Vankka/EnhancedLegacyText](https://github.com/Vankka/EnhancedLegacyText)
 MCDiscordReserializer       | Serializers for going between Minecraft & Discord                     | [Vankka/MCDiscordReserializer](https://github.com/Vankka/MCDiscordReserializer)
 Minedown                    | A markdown-style format for representing components                   | [Phoenix616/MineDown](https://github.com/Phoenix616/MineDown)
@@ -45,7 +44,6 @@ These libraries will often depend on one or more specific platforms to support t
 Name                | Description                                                           | Link
 --------------------|-----------------------------------------------------------------------|----------------------------------------------------
 Cloud               | A general-purpose Java command dispatcher & framework                 | [Incendo/cloud](https://github.com/Incendo/cloud)
-Core                | The Core allows you to register (mini)messages to a central database in multiple languages and access them via a very intuitive "key" and "locale" query. | [JuliGamesCore](https://github.com/JuliGames/JuliGamesCore)
 Creative            | A resource-pack library for Minecraft: Java Edition                   | [Creative](https://github.com/unnamed/creative)
 Inventory Framework | An inventory framework for managing GUIs                              | [Inventory Framework](https://github.com/stefvanschie/IF)
 LiteCommands        | A annotation based command framework for Velocity, Bukkit, BungeeCord | [LiteCommands](https://github.com/Rollczi/LiteCommands)