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`.

.gitattributes

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+# Normalize line endings to LF everywhere
+* text=auto eol=lf
+
+# ----------------------------
+# Binary files (never modified)
+# ----------------------------
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.webp binary
+*.ico binary
+*.pdf binary
+
+*.woff binary
+*.woff2 binary
+*.ttf binary
+*.otf binary
+
+*.zip binary
+*.tar binary
+*.gz binary
+*.7z binary
+*.rar binary
+
+# ----------------------------
+# Language-specific overrides
+# ----------------------------
+
+# Nix (important for flakes and reproducibility diffs)
+*.nix text eol=lf
+
+# Shell scripts
+*.sh text eol=lf
+*.bash text eol=lf
+Dockerfile text eol=lf
+docker-compose*.yml text eol=lf
+
+# Web / frontend
+*.js text eol=lf
+*.jsx text eol=lf
+*.ts text eol=lf
+*.tsx text eol=lf
+*.vue text eol=lf
+*.css text eol=lf
+*.scss text eol=lf
+*.html text eol=lf
+
+# Data/config formats
+*.json text eol=lf
+*.yaml text eol=lf
+*.yml text eol=lf
+*.toml text eol=lf
+*.ini text eol=lf
+*.editorconfig text eol=lf
+
+# Markdown
+*.md text eol=lf
+*.mdx text eol=lf
+
+# Git files
+.gitattributes text eol=lf
+.gitignore text eol=lf