Update README.md

README.md

@@ -26,13 +26,6 @@ or
 pip install .
 ```
 
-### NixOS
-A NixOS environment is also provided for an alternative setup method. This environment includes access to a compiled RNMC executable. To access the Nix development shell
-```
-nix develop
-```
-*Note: To use the NixOS environment, you must have root access on the system you are running on (i.e. This is usually not the case on supercomputers).*
-
 ## Running Simulations
 An example of local execution can be seen below.