163fb40 README/index.md: Rephrase and simplify license information

Authored and Committed by Libor Polčák 2 years ago
    README/index.md: Rephrase and simplify license information
    
    Keep the info in sync with the web footer. See also the thread starting
    with https://lists.nongnu.org/archive/html/js-shield/2021-08/msg00011.html.
    
        
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