Update readme file for json files #2042
Description
The readme file https://github.com/Slicer/ExtensionsIndex?tab=readme-ov-file#overview contains reference to the old .s4ext file format.
Also need to update the Slicer documentation.
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The readme file https://github.com/Slicer/ExtensionsIndex?tab=readme-ov-file#overview contains reference to the old .s4ext file format.
Also need to update the Slicer documentation.