Move Element to Flatpak / Homebrew

Element seems to need to compile electron every single update and, on
macOS, runs another app called electron that is not of use to me.
Flatpak and Homebrew will work faster and be user friendly all around.

modules/system/common/all-darwin.nix

@@ -40,6 +40,7 @@
       "angry-ip-scanner"
       "audacity"
       "balenaetcher"
+      "element"
       "firefox"
       "font-hack-nerd-font"
       "font-inconsolata-g-for-powerline"

modules/system/common/all-nixos.nix

@@ -49,6 +49,16 @@
   security.sudo.wheelNeedsPassword = false;
 
   services = {
+    flatpak = {
+      enable = true;
+      packages = [
+        "im.riot.Riot"
+      ];
+      update.auto = {
+        enable = true;
+        onCalendar = "daily";
+      };
+    };
     openssh.enable = true;
     tailscale = {
       enable = true;