docs: add missing extras instructions

Fixes #44

extras/lazygit/README.md

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+## Usage
+
+### Install
+
+1. Save the contents of `cyberdream.yml` or `cyberdream-light.yml` to `~/.config/lazygit/config.yml`. If your `config.yml` doesn't exist, create the directory first with `mkdir -p ~/.config/lazygit`. If the config file already exists, you may want to back it up first.
+
+See the [LazyGit documentation](https://github.com/jesseduffield/lazygit/blob/master/docs/Config.md) for more information.

extras/pywal/README.md

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+## Usage
+
+### Install
+
+1. Save the contents of either theme file:
+
+    - Dark theme: Save `cyberdream.json` to `~/.config/wal/colorschemes/dark/cyberdream.json`
+    - Light theme: Save `cyberdream-light.json` to `~/.config/wal/colorschemes/light/cyberdream-light.json`
+
+    If the directories don't exist, create them first with:
+
+    ```bash
+    mkdir -p ~/.config/wal/colorschemes/{dark,light}
+    ```
+
+2. Apply the theme using pywal:
+
+    ```bash
+    # For dark theme
+    wal --theme cyberdream
+
+    # For light theme
+    wal --theme cyberdream-light --light
+    ```
+
+See the [pywal documentation](https://github.com/dylanaraps/pywal/wiki/Customization#making-your-own-colorschemes) for more information about custom colorschemes.

extras/tilix/README.md

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+## Usage
+
+### Install
+
+1. Save the contents of either theme file:
+
+    - Dark theme: Save `cyberdream.json` to `~/.config/tilix/schemes/cyberdream.json`
+    - Light theme: Save `cyberdream-light.json` to `~/.config/tilix/schemes/cyberdream-light.json`
+
+    If the directory doesn't exist, create it first with:
+
+    ```bash
+    mkdir -p ~/.config/tilix/schemes
+    ```
+
+2. Apply the theme through Tilix:
+    - Open Tilix
+    - Go to Preferences
+    - Select your profile
+    - Switch to the "Colors" tab
+    - Select either "cyberdream" or "cyberdream-light" from the Color scheme dropdown
+
+See the [Tilix documentation](https://gnunn1.github.io/tilix-web/manual/themes/) for more information about color schemes.

extras/warp/README.md

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+## Usage
+
+### Install
+
+1. Save the contents of either theme file:
+
+    - Dark theme: Save `cyberdream.yaml` to `~/.warp/themes/cyberdream.yaml`
+    - Light theme: Save `cyberdream-light.yaml` to `~/.warp/themes/cyberdream-light.yaml`
+
+    If the directory doesn't exist, create it first with:
+
+    ```bash
+    mkdir -p ~/.warp/themes
+    ```
+
+2. Apply the theme through Warp:
+    - Open Warp
+    - Press `Cmd+P` (or `Ctrl+P` on Linux) to open the command palette
+    - Type "Open Theme Picker"
+    - Select either "cyberdream" or "cyberdream-light" from the available themes
+
+See the [Warp Themes documentation](https://docs.warp.dev/appearance/custom-themes) for more information about custom themes.

extras/windowsterminal/README.md

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+## Usage
+
+### Install
+
+1. Open Windows Terminal settings (Ctrl+,) and click "Open JSON file" in the bottom left corner.
+
+2. In the `schemes` array, add the contents of both `cyberdream.json` and `cyberdream-light.json`:
+
+    ```json
+    {
+        "schemes": [
+            {
+                // ... existing schemes ...
+            },
+            {
+                // paste cyberdream.json contents here
+            },
+            {
+                // paste cyberdream-light.json contents here
+            }
+        ]
+    }
+    ```
+
+3. Apply the theme:
+    - Open Windows Terminal Settings
+    - Select your profile
+    - Click "Appearance"
+    - Select either "cyberdream" or "cyberdream-light" from the "Color scheme" dropdown
+
+See the [Windows Terminal Color Schemes documentation](https://learn.microsoft.com/en-us/windows/terminal/customize-settings/color-schemes) for more information.

extras/zellij/README.md

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+## Usage
+
+### Install
+
+1. Save the contents of either theme file:
+
+    - Dark theme: Save `cyberdream.kdl` to `~/.config/zellij/themes/cyberdream.kdl`
+    - Light theme: Save `cyberdream-light.kdl` to `~/.config/zellij/themes/cyberdream-light.kdl`
+
+    If the directory doesn't exist, create it first with:
+
+    ```bash
+    mkdir -p ~/.config/zellij/themes
+    ```
+
+2. Apply the theme by either:
+    - Adding to your `config.kdl`:
+        ```kdl
+        // For dark theme
+        theme "cyberdream"
+        // Or for light theme
+        theme "cyberdream-light"
+        ```
+    - Or launching zellij with the theme flag:
+        ```bash
+        # For dark theme
+        zellij --theme cyberdream
+        # For light theme
+        zellij --theme cyberdream-light
+        ```
+
+See the [Zellij Themes documentation](https://zellij.dev/documentation/themes) for more information about custom themes.