docs: align table [skip ci]

README.md

@@ -23,7 +23,26 @@ Some example notebooks can be found in the [examples directory](examples).
 
 <!-- Examples -->
 <table><tbody>
-<tr><td>basic commands</td><td>importing tables</td><td>display MOCs</td></tr><tr><td><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/02_Base_Commands.html"><img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/02.png"></img></a></td><td><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/04_Importing_Tables.html"><img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/04.png"></img></a></td><td><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/05_Display_a_MOC.html"><img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/05.png"></img></a></td></tr><tr><td>display sky regions</td><td>retrieve data from the widget</td><td>advanced app</td></tr><tr><td><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/09_Displaying_Shapes.html"><img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/09.png"></img></a></td><td><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/11_Extracting_information_from_the_view.html"><img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/11.png"></img></a></td><td><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/10_Advanced-GUI.html"><img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/10.png"></img></a></td></tr></tbody></table>
+<tr>
+  <td align="center">basic commands</td>
+  <td align="center">importing tables</td>
+  <td align="center">display MOCs</td></tr><tr>
+    <td align="center"><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/02_Base_Commands.html">
+      <img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/02.png"></img></a></td>
+    <td align="center"><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/04_Importing_Tables.html">
+      <img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/04.png"></img></a></td>
+    <td align="center"><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/05_Display_a_MOC.html">
+      <img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/05.png"></img></a></td></tr><tr>
+  <td align="center">display sky regions</td>
+  <td align="center">retrieve data from the widget</td>
+  <td align="center">advanced app</td></tr><tr>
+    <td align="center"><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/09_Displaying_Shapes.html">
+      <img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/09.png"></img></a></td>
+    <td align="center"><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/11_Extracting_information_from_the_view.html">
+      <img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/11.png"></img></a></td>
+    <td align="center"><a href="https://cds-astro.github.io/ipyaladin/_collections/notebooks/10_Advanced-GUI.html">
+      <img height="125" src="https://cds-astro.github.io/ipyaladin/_static/notebooks_thumbnails/10.png"></img></a></td></tr>
+</tbody></table>
 <!-- Examples -->
 
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/cds-astro/ipyaladin/master). You can also try it directly [in mybinder](https://mybinder.org/v2/gh/cds-astro/ipyaladin/master), without installing anything.