Add configuration for Librewolf and Zen browser with privacy-focused policies

- Created Librewolf configuration in `home/programs/librewolf/system.nix` with telemetry disabled, enhanced security settings, and enforced extensions.
- Added Zen browser configuration in `home/programs/zen/default.nix` and `home/programs/zen/system.nix`, including similar privacy policies and default search engine settings.
- Introduced `hosts/home-pc/configuration.nix` for system-wide settings, including USBGuard rules and firewall configurations.
- Established `hosts/home-pc/flake.nix` to manage NixOS modules and configurations.
- Generated `hosts/home-pc/hardware-configuration.nix` for hardware-specific settings.
- Created `hosts/home-pc/home.nix` to import various user-specific applications and settings.
- Added profile picture in `hosts/home-pc/profile_picture.jpg`.
- Implemented secrets management in `hosts/home-pc/secrets/default.nix` and `hosts/home-pc/secrets/secrets.yaml` using SOPS for encryption.
- Defined user-specific variables in `hosts/home-pc/variables.nix`, including hostname, username, and locale settings.
- Added profile picture for laptop in `hosts/laptop/profile_picture.jpg`.

hosts/home-pc/secrets/default.nix

@@ -0,0 +1,58 @@
+# Those are my secrets, encrypted with sops
+# You shouldn't import this file, unless you edit it
+{
+  inputs,
+  pkgs,
+  config,
+  ...
+}: let
+  home = config.home.homeDirectory;
+in {
+  imports = [inputs.sops-nix.homeManagerModules.sops];
+
+  sops = {
+    age.keyFile = "${home}/.config/sops/age/keys.txt";
+    defaultSopsFile = ./secrets.yaml;
+    secrets = {
+      ssh-config = {
+        path = "${home}/.ssh/config";
+      };
+      netrc = {
+        path = "${home}/.netrc";
+      };
+      github-key = {
+        path = "${home}/.ssh/github";
+      };
+      gitlab-key = {
+        path = "${home}/.ssh/gitlab";
+      };
+    };
+  };
+
+  home.file.".config/nixos/.sops.yaml".text = ''
+    keys:
+      - &primary age12yvtj49pfh3fqzqflscm0ek4yzrjhr6cqhn7x89gdxnlykq0xudq5c7334
+      - &work age1c8pawdsxptfslgrz2c56s39mrtnjzc5mm3hfzgr2wdwu2v6vfsdsupjsq6
+    creation_rules:
+      - path_regex: hosts/laptop/secrets/secrets.yaml$
+        key_groups:
+          - age:
+            - *primary
+      - path_regex: hosts/server/secrets/secrets.yaml$
+        key_groups:
+          - age:
+            - *primary
+      - path_regex: hosts/work/secrets/secrets.yaml$
+        key_groups:
+          - age:
+            - *work
+  '';
+
+  systemd.user.services.mbsync.Unit.After = ["sops-nix.service"];
+  home.packages = with pkgs; [
+    sops
+    age
+  ];
+
+  wayland.windowManager.hyprland.settings.exec-once = ["systemctl --user start sops-nix"];
+}