fix: update URLs in contributing document

CONTRIBUTING.md

@@ -4,11 +4,11 @@
 
 - Although I do my best to keep up with the latest changes and releases, but if you find something that needs to update, please contribute.
 
-- If you’d like to contribute to this project, reach out to me on social media or [Discord](https://discord.gg/bz2SN7d), or create a pull request for the necessary changes.
+- If you’d like to contribute to this project, reach out to me on social media or [Discord](https://christianlempa.de/discord), or create a pull request for the necessary changes.
 
 ## Project overview
 
-To get an overview of the project, read the [README](https://github.com/xcad2k/boilerplates#readme).
+To get an overview of the project, read the [README](https://github.com/ChristianLempa/boilerplates#readme).
 
 ## Issues