docs: restructured docs layout

docs/user/getting_started/getting_started.md

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+(user.getting_started)=
+# Getting Started
+This section provides a comprehensive guide to getting started with BEC Widgets. Whether you are new to BEC Widgets or looking to refresh your knowledge, this guide will help you set up and navigate the framework with ease.
+
+```{toctree}
+---
+maxdepth: 2
+hidden: true
+---
+
+getting_started/installation
+```

docs/user/getting_started/installation.md

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+(user.installation)=
+# Installation
+
+
+**Prerequisites**
+
+Before installing BEC Widgets, please ensure the following requirements are met:
+
+1. **Python Version:** BEC Widgets requires Python version 3.10 or higher. Verify your Python version to ensure compatibility.
+2. **BEC Installation:** BEC Widgets works in conjunction with BEC. While BEC is a dependency and will be installed automatically, you can find more information about BEC and its installation process in the [BEC documentation](https://beamline-experiment-control.readthedocs.io/en/latest/).
+
+**Standard Installation**
+
+Install BEC Widgets using the pip package manager. Open your terminal and execute:
+
+```bash
+pip install bec_widgets PyQt6
+```
+
+This command installs BEC Widgets along with its dependencies, including the default PyQt6.
+
+**Selecting a PyQt Version**
+
+BEC Widgets supports both PyQt5 and PyQt6. To install a specific version, use:
+
+For PyQt6:
+
+```bash
+pip install bec_widgets[pyqt6]
+```
+
+For PyQt5:
+
+```bash
+pip install bec_widgets[pyqt5]
+```
+
+**Troubleshooting**
+
+If you encounter issues during installation, particularly with PyQt, try purging the pip cache:
+
+```bash
+pip cache purge
+```
+
+This can resolve conflicts or issues with package installations.