Fixed link on docs home page (#3220)

Co-authored-by: screret <68943070+screret@users.noreply.github.com>

Author: GravityProtogen

docs/content/index.md

@@ -23,6 +23,5 @@ You can download an offline version of this wiki here:
 
 
 ## Want to Contribute?
-
-If you want to contribute to this documentation site, feel free to open a pull request on
-[its GitHub repository](https://github.com/GregTechCEu/gtceu-modern-docs).
+If you want to contribute to this documentation site, feel free to read [the instructions](https://github.com/GregTechCEu/GregTech-Modern/blob/1.20.1/docs/CONTRIBUTING.md) and open a pull request on the [GitHub repository](https://github.com/GregTechCEu/GregTech-Modern).
+```