docs: Remove duplicate uninstallation section

Author: mokou

README.md

@@ -112,13 +112,6 @@ After every couple of sections, there will be a quiz that'll test your knowledge
 
 Once you've completed Rustlings, put your new knowledge to good use! Continue practicing your Rust skills by building your own projects, contributing to Rustlings, or finding other open-source projects to contribute to.
 
-If you'd like to uninstall Rustlings, you can do so by invoking cargo and removing the rustlings directory:
-
-```bash
-cargo uninstall rustlings
-rm -r rustlings/ # or on Windows: rmdir /s rustlings
-```
-
 ## Uninstalling Rustlings
 
 If you want to remove Rustlings from your system, there's two steps. First, you'll need to remove the exercises folder that the install script created