restructure with nixos modules

bash/default.nix

@@ -0,0 +1,19 @@
+{
+  config = {
+    programs.bash = {
+      enable = true;
+      shellAliases = {
+        htop = "btop";
+        gp = "git push";
+        gco = "git checkout";
+        gd = "git diff";
+        gc = "git commit";
+        gpl = "git pull";
+        gb = "git branch";
+        ga = "git add";
+        gl = "git log";
+        gs = "git status";
+      };
+    };
+  };
+}