[V3] Used proxy-githubusercontent ressources from a GitHub repository

[eliselavy]

For the moment only one article will required this feature, see comment here in order to reduce the size of the ipynb

For the moment not possible to IFrame some ressources defined in the GitHub repository:

Example:

<iframe
    src="./media/m_overview_interactive.html"
    width="100%"
    height="600"
    style="border: 0;"
    loading="lazy"
    referrerpolicy="no-referrer"
>    
</iframe>

https://journalofdigitalhistory.org/media/m_rai_lisa_dual.html 404
https://journalofdigitalhistory.org/media/m_overview_interactive.html 404

By including with the raw url:

<iframe
    src="https://raw.githubusercontent.com/jdh-observer/2aqBy3goJMT5/lazy-loading-227/media/m_rai_lisa_dual.html"

Refused to display 'https://raw.githubusercontent.com/' in a frame because it set 'X-Frame-Options' to 'deny'.