feat: add support section for Demo Time merch in README and contribute documentation

Author: estruyf

apps/vscode-extension/README.md

@@ -152,6 +152,9 @@ located in the `tests/` directory.
 If you enjoy my work and find them useful, consider sponsor me and the ecosystem
 to help Open Source sustainable. Thank you!
 
+You can also show your support by getting
+[Demo Time merch](https://demo-time.myspreadshop.be/)!
+
 ## License
 
 This project is licensed under the Apache License 2.0 - see the

docs/src/content/docs/contribute.mdx

@@ -61,3 +61,7 @@ The source of the documentation can be found in the [vscode-demo-time - GitHub r
 If you like Demo Time, you can help us by spreading the word. Share it with your friends, colleagues, and on social media.
 
 If you have articles, videos, projects, or anything else related to Demo Time feel free to share it with us. We can add it to the list of projects or showcases on the website.
+
+## Support through merch
+
+Want to show your support for Demo Time? Check out our [official merch store](https://demo-time.myspreadshop.be/) where you can get Demo Time branded items. It's a great way to support the project while getting some cool gear!