overlays: remove i3status-rust from overlays

overlays/default.nix

@@ -1,5 +1,4 @@
 {
-  i3status-rust = import ./i3status-rust;
   chrysalis = import ./chrysalis;
   hugin = import ./hugin;
 }

overlays/i3status-rust/default.nix

@@ -1,20 +0,0 @@
-final: prev: {
-  # overlay created because nixpkgs's `i3status-rust` depended on `notmuch`, and
-  # `notmuch`'s tests were briefly broken. the features I'm disabling, I don't
-  # need anyway: (at the time of writing)
-  #
-  # - notmuch
-  # - maildir
-  i3status-rust = prev.i3status-rust.overrideAttrs (oldAttrs: {
-    buildInputs = builtins.attrValues {
-      inherit
-        (final)
-        dbus
-        lm_sensors
-        openssl
-        pulseaudio
-        ;
-    };
-    cargoBuildFeatures = ["pulseaudio"];
-  });
-}