Organize release structure and documentation

docs/INSTALL.md

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+# Install and Use Taskbar Launcher
+
+## Small Package
+
+The small package requires:
+
+- Windows x64
+- Microsoft .NET 10 Desktop Runtime x64
+
+Download .NET 10 Desktop Runtime:
+
+https://dotnet.microsoft.com/en-us/download/dotnet/10.0
+
+Install the **.NET Desktop Runtime** for **Windows x64**.
+
+## Install
+
+1. Extract the Taskbar Launcher zip to a folder.
+2. Run `TaskbarLauncher.exe`.
+3. The app appears in the system tray.
+4. Press `Ctrl+Alt+Space` to open the launcher.
+
+## Configure
+
+Open the tray menu and choose **Settings**.
+
+From Settings you can:
+
+- Add top-level menus
+- Add submenus
+- Add folders, apps, files, and websites
+- Drag/drop items to reorder
+- Set per-item icon sizes
+- Back up and restore `config.json`
+- Enable Start with Windows
+
+## Portable Settings
+
+The app stores settings in:
+
+```text
+config.json
+```
+
+Keep `config.json` beside `TaskbarLauncher.exe`.
+
+If `config.json` is missing, the app creates a clean starter config on first run.