Revert "Set up cachix as emacs-overlay binary cache"

This reverts commit 1223542226.

cachix/nix-community.nix

@@ -1,8 +0,0 @@
-{
-  nix = {
-    binaryCaches = [ "https://nix-community.cachix.org" ];
-    binaryCachePublicKeys = [
-      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
-    ];
-  };
-}

modules/cachix.nix

@@ -1,13 +0,0 @@
-# WARN: this file will get overwritten by $ cachix use <name>
-{ pkgs, lib, ... }:
-
-let
-  folder = ../cachix;
-  toImport = name: value: folder + ("/" + name);
-  filterCaches = key: value: value == "regular" && lib.hasSuffix ".nix" key;
-  imports = lib.mapAttrsToList toImport
-    (lib.filterAttrs filterCaches (builtins.readDir folder));
-in {
-  inherit imports;
-  nix.binaryCaches = [ "https://cache.nixos.org/" ];
-}

modules/software.nix

@@ -37,6 +37,7 @@
     podman-compose
     shellcheck
     shfmt
+    android-studio
     gnumake
     nodePackages.pyright
     black
@@ -74,8 +75,6 @@
     zip
     unzip
     unrar
-    # Overlays
-    cachix
   ];
 
   # Fonts declaration