docs: update zellij-ps to reflect project switcher functionality

- Update package description and fix mainProgram typo
- Rewrite documentation to describe project switching, not process viewing
- Add PROJECT_FOLDERS configuration and usage examples
- Update all references across docs (README, guides, module overviews)

README.md

@@ -22,36 +22,20 @@ Personal Nix flake repository: custom packages, overlays, NixOS modules, and Hom
 - ⚙️ [Modules](./docs/modules/)
 - 📖 [Guides](./docs/guides/)
 
-## Installation
-
-### Add to Your Flake
-
-```nix
-{
-  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-    m3ta-nixpkgs.url = "git+https://code.m3ta.dev/m3tam3re/nixpkgs";
-  };
-}
-```
-
-### Quick Start
+## Quick Start
 
 ```bash
+# Add to your flake
+nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+m3ta-nixpkgs.url = "git+https://code.m3ta.dev/m3tam3re/nixpkgs";
+
 # Build a package
 nix build git+https://code.m3ta.dev/m3tam3re/nixpkgs#code2prompt
 
 # Run a package
 nix run git+https://code.m3ta.dev/m3tam3re/nixpkgs#zellij-ps
-
-# List all available packages
-nix flake show git+https://code.m3ta.dev/m3tam3re/nixpkgs
 ```
 
-## Documentation
-
-For detailed usage, module documentation, package references, and contribution guidelines, see the [full documentation](./docs).
-
 ## Available Packages
 
 | Package            | Description                           |
@@ -63,7 +47,11 @@ For detailed usage, module documentation, package references, and contribution g
 | `msty-studio`      | Msty Studio application               |
 | `pomodoro-timer`   | Pomodoro timer utility                |
 | `tuxedo-backlight` | Backlight control for Tuxedo laptops  |
-| `zellij-ps`        | Process viewer for Zellij             |
+| `zellij-ps`        | Project switcher for Zellij           |
+
+## Documentation
+
+For detailed usage, module documentation, package references, and contribution guidelines, see the [full documentation](./docs).
 
 ## License