feat!(flake): update homix

Update flake (`neovim-nightly-overlay` is fixed)
Format all `.nix` files
Unify package/module argument order:
    - `inputs`, `outputs`, `lib`, `pkgs`, `config`, ...
Move Jellyfin config to a `NixOS` module (first one, yay)
Add `direnv` to `reo101-shell` modules (was used, but not defined as wanted)
    - TODO: make it optional (module config options)

flake.lock

@@ -22,6 +22,22 @@
         "type": "github"
       }
     },
+    "diffz": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1676154556,
+        "narHash": "sha256-foiZMt5GBbbLEZPPK/qgkjQ6FCj2rLPniaF8rC5Z56w=",
+        "owner": "ziglibs",
+        "repo": "diffz",
+        "rev": "f25b31c4f8d06bc134018133a2d57b6dcbb6941e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ziglibs",
+        "repo": "diffz",
+        "type": "github"
+      }
+    },
     "flake-compat": {
       "flake": false,
       "locked": {
@@ -215,11 +231,11 @@
       },
       "locked": {
         "dir": "contrib",
-        "lastModified": 1675657440,
-        "narHash": "sha256-UkEa4LKXLNglbn5U2o/zee9AePaVVzLkhe06rv6jtDg=",
+        "lastModified": 1676135764,
+        "narHash": "sha256-hsvokBMpst2PNY5s4kK5ioLUPgrZCFTmqzlAzWhg2tU=",
         "owner": "neovim",
         "repo": "neovim",
-        "rev": "6c39edaa7e5060cedfbbf61e88f4aad20fdff73d",
+        "rev": "3a5dddf24f9d4d8959194b0cd3c6a7dd0cbd73ae",
         "type": "github"
       },
       "original": {
@@ -236,11 +252,11 @@
         "nixpkgs": "nixpkgs"
       },
       "locked": {
-        "lastModified": 1675671305,
-        "narHash": "sha256-AUcqYR+hZsGz0LCA+FNXejCEToLRceFXia4zMqxh2KE=",
+        "lastModified": 1676234956,
+        "narHash": "sha256-T9YgPMgos3N/2uOtJjnrcj6Q1EZMnB48DPXNGWJ53+c=",
         "owner": "nix-community",
         "repo": "neovim-nightly-overlay",
-        "rev": "3660ca973f7f9608855abc497626776745c701e3",
+        "rev": "00dbc7537c2012fabd1e414e2ca3314ce5281959",
         "type": "github"
       },
       "original": {
@@ -354,11 +370,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1675545634,
-        "narHash": "sha256-TbQeQcM5TA/wIho6xtzG+inUfiGzUXi8ewwttiQWYJE=",
+        "lastModified": 1676110339,
+        "narHash": "sha256-kOS/L8OOL2odpCOM11IevfHxcUeE0vnZUQ74EOiwXcs=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "0591d6b57bfeb55dfeec99a671843337bc2c3323",
+        "rev": "e5530aba13caff5a4f41713f1265b754dc2abfd8",
         "type": "github"
       },
       "original": {
@@ -505,11 +521,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1675685322,
-        "narHash": "sha256-iQLyJcfDd5+mRF8b9sT4R/tLhwkTYOxKoaqgoAovlKo=",
+        "lastModified": 1676203669,
+        "narHash": "sha256-NfCgGW/7TtGo1zrqErLA6YfZ+Wp22VVZL4l0BdKDEeU=",
         "owner": "mitchellh",
         "repo": "zig-overlay",
-        "rev": "2c7f714a6c7fdc85289d3dc201510ea7396656b5",
+        "rev": "e833895bbdd7113885cbf4330601826cc17db8ab",
         "type": "github"
       },
       "original": {
@@ -543,6 +559,7 @@
     },
     "zls-overlay": {
       "inputs": {
+        "diffz": "diffz",
         "flake-utils": "flake-utils_3",
         "gitignore": "gitignore",
         "known-folders": "known-folders",
@@ -553,11 +570,11 @@
         "zig-overlay": "zig-overlay_2"
       },
       "locked": {
-        "lastModified": 1675675529,
-        "narHash": "sha256-b9Pl7J46NR5SM7ZnNnOhHssJlJh1sAiz1jF5q/otso4=",
+        "lastModified": 1676154655,
+        "narHash": "sha256-6Qqjij5cgKkLyfnT0rFHhvSGu5NV1J+1eoTi6oI97kg=",
         "owner": "zigtools",
         "repo": "zls",
-        "rev": "1b3274aa9c4c79ece06427b1367d392b3849dfb0",
+        "rev": "7919da5054a6e6ac100097f762e7abe96628eef0",
         "type": "github"
       },
       "original": {