docs(awesome): add Remnawave Customizer guide

docs/awesome-remnawave/_install-guides/remnawave-customizer.md

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+### 🎨 Key Features
+
+- Terminal-based customization for Remnawave Panel
+- Ready-made theme presets with an interactive color palette
+- Custom accent, background, surface colors and element rounding
+- Optional subtle visual effects that automatically follow the selected theme
+- Safe reset back to the original Remnawave appearance
+- Keeps the official Remnawave frontend files untouched, so normal Panel updates can still be used
+
+### 🚀 Installation
+
+:::warning
+Remnawave Customizer must be installed **only on the server where Remnawave Panel is running**. Root privileges are required.
+:::
+
+Clone the repository:
+
+```bash
+git clone https://github.com/bruhxax/remnawave-customizer.git
+cd remnawave-customizer
+```
+
+Before running the installer, review it:
+
+```bash
+less install.sh
+```
+
+Then install Customizer:
+
+```bash
+sudo ./install.sh
+```
+
+Launch the interactive menu:
+
+```bash
+customizer
+```
+
+### 🔄 Updating
+
+```bash
+cd ~/remnawave-customizer
+git pull
+sudo ./install.sh --no-setup
+```
+
+Your theme settings are preserved during updates.
+
+### 🧹 Full uninstall
+
+```bash
+cd ~/remnawave-customizer
+sudo ./uninstall.sh --purge
+```
+
+This restores the original Remnawave appearance and removes Customizer settings and runtime files.
+
+### 🔗 Links
+
+- [GitHub Repository](https://github.com/bruhxax/remnawave-customizer)