535907 More improvements based on feedback from Lukas and Jie.

Authored and Committed by sergiodj 2 years ago
    More improvements based on feedback from Lukas and Jie.
    
    - Explain that we had pre-Free Software Movement scenario, to give
      more context.
    
    - Mention the term "proprietary".
    
    - New section "A bit about licenses", with stuff about copyleft and
      permissive.
    
    - Un-texttt "GNU".
    
    - New section "More than just code", with a preparation for the
      "upstream" section.
    
    - Mention Matrix and Rocket.chat.
    
        
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