refactor: improve documentation layout for quick start and advanced showcase sections

Author: PierreRaybaut

README.md

@@ -37,10 +37,10 @@ It is a **complementary execution layer** that turns DataLab into a hybrid scien
 
 **Experience DataLab-Kernel instantly in your browser** — no installation required!
 
-| Notebook | Description | Link |
-| --- | --- | --- |
-| **Quick Start** | Introduction to Workspace, Plotter, and basic Sigima processing | [![Quick Start](https://img.shields.io/badge/Quick_Start-notebook.link-e2d610?logo=jupyter&logoColor=white)](https://notebook.link/github/DataLab-Platform/DataLab-Kernel/tree/main/notebooks/?path=/notebooks/datalab_kernel_quickstart.ipynb) |
-| **Advanced Showcase** | Advanced plotting, signal/image processing, ROI, and analysis | [![Advanced Showcase](https://img.shields.io/badge/Advanced_Showcase-notebook.link-e2d610?logo=jupyter&logoColor=white)](https://notebook.link/github/DataLab-Platform/DataLab-Kernel/tree/main/notebooks/?path=%2Fnotebooks%2Fdatalab_kernel_advanced.ipynb) |
+| | |
+| --- | --- |
+| [![Quick Start](https://img.shields.io/badge/Quick_Start-notebook.link-e2d610?logo=jupyter&logoColor=white)](https://notebook.link/github/DataLab-Platform/DataLab-Kernel/tree/main/notebooks/?path=/notebooks/datalab_kernel_quickstart.ipynb) | Introduction to Workspace, Plotter, and basic Sigima processing |
+| [![Advanced Showcase](https://img.shields.io/badge/Advanced_Showcase-notebook.link-e2d610?logo=jupyter&logoColor=white)](https://notebook.link/github/DataLab-Platform/DataLab-Kernel/tree/main/notebooks/?path=%2Fnotebooks%2Fdatalab_kernel_advanced.ipynb) | Advanced plotting, signal/image processing, ROI, and analysis |
 
 Click a badge to open the notebook in a live JupyterLite environment powered by [**notebook.link**](https://notebook.link/). This service, developed by [**QuantStack**](https://quantstack.net/), enables sharing and running Jupyter notebooks directly in the browser with zero setup.
 

doc/index.rst

@@ -87,18 +87,12 @@ Try it Online
 **Experience DataLab-Kernel instantly in your browser** — no installation required!
 
 .. list-table::
-   :header-rows: 1
-   :widths: 20 50 30
+   :widths: 30 70
 
-   * - Notebook
-     - Description
-     - Link
-   * - **Quick Start**
+   * - |badge_quickstart|
      - Introduction to Workspace, Plotter, and basic Sigima processing
-     - |badge_quickstart|
-   * - **Advanced Showcase**
+   * - |badge_advanced|
      - Advanced plotting, signal/image processing, ROI, and analysis
-     - |badge_advanced|
 
 .. |badge_quickstart| image:: https://img.shields.io/badge/Quick_Start-notebook.link-e2d610?logo=jupyter&logoColor=white
    :target: https://notebook.link/github/DataLab-Platform/DataLab-Kernel/tree/main/notebooks/?path=/notebooks/datalab_kernel_quickstart.ipynb