Various changes

- `hs` host
  - cam subdomain behind reverse proxy
  - dynamic dns updater script
- `pc` host
  - ext4 instead of btrfs
  - ca-derivations experimental feature
- nix from unstable channel (2.8)
- cura from stable (unstable went broken)
- Emacs
  - company-nixos-options
  - helm-nixos-options
  - nix-modeline
  - disable format hook on save for nix mode
- nix from master (only in overlay, not used)
- bat (alias for cat)
- batman (alias for batman)
- disabled weird extra options for nix I couldn't even remember of
- Fira Code for sway/waybar
- New plain style for waybar

profiles/core/default.nix

@@ -8,6 +8,8 @@ in
   environment = {
 
     systemPackages = with pkgs; [
+      bat
+      bat-extras.batman
       binutils
       coreutils
       curl
@@ -58,12 +60,6 @@ in
     useSandbox = true;
     allowedUsers = [ "@wheel" ];
     trustedUsers = [ "root" "@wheel" ];
-    extraOptions = ''
-      min-free = 536870912
-      keep-outputs = true
-      keep-derivations = true
-      fallback = true
-    '';
   };
 
   services.earlyoom.enable = true;