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

pkgs/default.nix

@@ -17,7 +17,7 @@ in
   customEmacs = prev.callPackage (import ./emacs) { };
   amule = prev.callPackage (import ./amule) { };
   digikam = nixpkgsUnstable.digikam;
-  cura = nixpkgsUnstable.cura;
+  #cura = nixpkgsUnstable.cura;
   qutebrowser = import ./qutebrowser { pkgs = prev; };
   #firefox-unwrapped = nixpkgsUnstable.firefox-unwrapped;
   xdg-desktop-portal = nixpkgsUnstable.xdg-desktop-portal;
@@ -30,5 +30,7 @@ in
   v4l2loopback-dc = prev.callPackage (import ./v4l2loopback-dc) { kernel = prev.linux; };
   slack = import ./slack { pkgs = prev; };
   google-chrome = import ./google-chrome { pkgs = prev; };
+  nixFromMaster = import ./nix-from-master { nix = nixpkgsUnstable.nix; pkgs = prev; };
+  nix = nixpkgsUnstable.nix;
   # then, call packages with `final.callPackage`
 }