removed oh-my-posh/ use oh-my-zsh with some plugins + add a custom cat using colorize plugin

modules/home-manager/zsh.nix

@@ -4,7 +4,18 @@
   programs.zsh = {
     enable = true;
     autosuggestion.enable = true;
-    initContent = "fastfetch\n";
+    initContent = ''
+# Safe cat that uses colorize plugin ccat
+custom-cat() {
+  if [[ -t 1 ]]; then
+    ccat "$@"
+  else
+    command cat "$@"
+  fi
+}
+
+    fastfetch\n''
+    ;
     shellAliases = {
 	".." = "z ..";
 	grep = "rg";
@@ -12,6 +23,7 @@
 	la = "ls -A";
 	l = "ls -CF";
 	ls = "ls -hA -s --color";
-    };
+	cat = "custom-cat";
+};
   };
 }