update readme

README.md

@@ -21,16 +21,11 @@ that I thought a new user might want to understand as nix is rather poorly
 documented.
 
 ## Maintaining
-I've included a make file to keep remote systems up to date, here's an example
+I've included a dev shell to keep the system up to date. To enter the shell run:
-of what I use to deploy to crayon:
 ```sh
-make deploy IP=squi.bid HOST=crayon
+nix develop
 ```
-This step requires the remote system to have a crown user who can execute sudo
+Once you've entered the shell will give you a rundown on what you can do.
-commands without an interactive prompt.
-
-I'll probably end up switching to something more standard once I've got the
-time.
 
 ## TODO:
 - [ ] blob