[chore] removing repositories sections since it has been already implemented in readme

Author: Alystrasz

CONTRIBUTING.md

@@ -2,20 +2,6 @@
 
 Thank you for investing your time in contributing to our project!
 
-## Repositories architecture
-
-Northstar software is split into several repositories:
-
-* [Northstar](https://github.com/R2Northstar/Northstar) is the main repository; it only contains downloadable 
-versions of the client and wiki documentation (it does not contain source code).
-* [NorthstarMasterServer](https://github.com/R2Northstar/NorthstarMasterServer)
-holds source code of the master server, which is responsible for authentication, persistence, custom servers
-listing.
-* [NorthstarLauncher](https://github.com/R2Northstar/NorthstarLauncher) holds source code responsible for 
-injecting custom content (mods) into original game files.
-* [NorthstarMods](https://github.com/R2Northstar/NorthstarMods) contains mods recreating server gamelogic,
-enabling custom server hosting.
-
 ## Issues
 
 ### Create a new issue 
@@ -25,6 +11,5 @@ already exists on GitHub.
 
 Afterwards, please check Discord `faq`, `help` and `bug` channels for corresponding threads.
 
-Also, please double-check that you're opening an issue in the correct repository (read carefully `Repositories architecture`
-of this document if you're not sure).
+Also, please double-check that you're opening an issue in the correct repository (read carefully readme `Development` section if you're not sure).