feat(btm): added current usage to the field

apps/bottom/default.nix

@@ -2,6 +2,38 @@
   programs.bottom = {
     enable = true;
     settings = {
+      flags = {
+        rate = 1000;
+        hide_table_gap = true;
+        hide_time = true;
+        left_legend = true;
+        network_use_bytes = true;
+        temperature_type = "c";
+        mem_as_value = true;
+        current_usage = true;
+      };
+      row = [
+        {
+          ratio = 4;
+          child = [
+            { type = "cpu"; }
+          ];
+        }
+        {
+          ratio = 3;
+          child = [
+            { type = "mem"; }
+            { type = "net"; }
+          ];
+        }
+        {
+          ratio = 3;
+          child = [
+            { type = "temp"; }
+            { type = "disk"; }
+          ];
+        }
+      ];
     };
   };
 }