fix: optimize external dependency specifications

remove busybox (pure bloat) and unnecessary documentation

app/Main.hs

@@ -1,7 +1,5 @@
--- requires 'at' for running a command at a certain time
--- requires 'date' for converting unix time to human readable time
 -- run on boot and at noon and midnight
--- don't add commands to at while this script is running (monadic purity must be preserved)
+-- don't add commands to `at` while this script is running (monadic purity must be preserved)
 
 module Main where
 

flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "Flake for suntheme's development environment and builds";
+  description = "Suntheme's development and build environment";
 
   inputs.haskellNix.url = "github:input-output-hk/haskell.nix";
   inputs.nixpkgs.follows = "haskellNix/nixpkgs-unstable";
@@ -31,7 +31,6 @@
             };
             shell.buildInputs = with pkgs; [
               at
-              busybox
             ];
           };
         })