fix: deprecate zen in favour of vanilla firefox

firefox has vertical tabs now, tab grouping, and soon split view

flake.lock

@@ -162,27 +162,6 @@
         "type": "github"
       }
     },
-    "home-manager_3": {
-      "inputs": {
-        "nixpkgs": [
-          "zen-browser",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1767104570,
-        "narHash": "sha256-GKgwu5//R+cLdKysZjGqvUEEOGXXLdt93sNXeb2M/Lk=",
-        "owner": "nix-community",
-        "repo": "home-manager",
-        "rev": "e4e78a2cbeaddd07ab7238971b16468cc1d14daf",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "home-manager",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1748162331,
@@ -264,8 +243,7 @@
         "home-manager": "home-manager_2",
         "nixpkgs": "nixpkgs_2",
         "nixvim": "nixvim",
-        "nur": "nur",
-        "zen-browser": "zen-browser"
+        "nur": "nur"
       }
     },
     "systems": {
@@ -297,27 +275,6 @@
         "repo": "default",
         "type": "github"
       }
-    },
-    "zen-browser": {
-      "inputs": {
-        "home-manager": "home-manager_3",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1767502237,
-        "narHash": "sha256-rRrn9I4H692troUl5pBtE3Y5mG2msSMU/2ro7+ZQrFM=",
-        "owner": "0xc000022070",
-        "repo": "zen-browser-flake",
-        "rev": "e3efa5e2b53982f985044062c98426ec75d6695b",
-        "type": "github"
-      },
-      "original": {
-        "owner": "0xc000022070",
-        "repo": "zen-browser-flake",
-        "type": "github"
-      }
     }
   },
   "root": "root",