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/emacs/default.nix

@@ -12,6 +12,7 @@ emacsWithPackages (
       aggressive-indent
       all-the-icons
       company
+      company-nixos-options
       dap-mode
       diff-hl
       envrc
@@ -25,6 +26,7 @@ emacsWithPackages (
       helm
       helm-ag
       helm-company
+      helm-nixos-options
       helm-projectile
       lispy
       lsp-haskell
@@ -34,6 +36,8 @@ emacsWithPackages (
       magit
       magit-delta
       nix-mode
+      nix-modeline
+      nixos-options
       notmuch
       org-download
       org-fragtog