README.md: add GLF OS credits

and adapt various config elements from it

Signed-off-by: unexplrd <unexplrd@linerds.us>

modules/nixos/config/misc/default.nix

@@ -1,3 +1,3 @@
 {
-  imports = [./slim.nix];
+  imports = [./slim.nix ./zram.nix];
 }

modules/nixos/config/misc/zram.nix

@@ -0,0 +1,8 @@
+{
+  zramSwap = {
+    enable = true;
+    algorithm = "zstd";
+    memoryPercent = 25;
+    priority = 5;
+  };
+}