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

flake.lock

@@ -329,11 +329,11 @@
     },
     "nixpkgsDevInput": {
       "locked": {
-        "lastModified": 1650450000,
-        "narHash": "sha256-/ASymH28AS7KsNvkQ1RMKRoCQKSi1AsWkHdJpQwhXCg=",
+        "lastModified": 1650581082,
+        "narHash": "sha256-aq5jnmGhP0hSXYozkxUKpgSZILvDobxB976JZFG6If8=",
         "owner": "aciceri",
         "repo": "nixpkgs",
-        "rev": "cf941213b48d9602be0dc2656e02e065740798ab",
+        "rev": "24b40a255c6adc6ab32c69737e8b4cfc50d8c8b4",
         "type": "github"
       },
       "original": {
@@ -459,11 +459,11 @@
     },
     "unstable": {
       "locked": {
-        "lastModified": 1650161686,
-        "narHash": "sha256-70ZWAlOQ9nAZ08OU6WY7n4Ij2kOO199dLfNlvO/+pf8=",
+        "lastModified": 1652172129,
+        "narHash": "sha256-8e2JMrswaKe02P8rYfvIMoc59pNuw6h/GYu8DBE1c+0=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "1ffba9f2f683063c2b14c9f4d12c55ad5f4ed887",
+        "rev": "f419dc5763c2b3c5580e396dea065b6d8b58ee27",
         "type": "github"
       },
       "original": {