map.save() to support an option to export leaflet dependencies (js/css/icons) as inline base64 uris

Is your feature request related to a problem? Please describe.

folium maps exported as html still depend on external leaflet dependencies (either from internet or on relative paths - manual modification is needed)

Describe the solution you'd like

Something similar to knit in RStudio (which produces the html with the inlined resources). I believe the R leaflet package is self-contained (it contains leaflet's resources), so for this to work in the same manner in folium, additional options to override default_js/default_css may be necessary (i.e. to point them to relative/static paths).

Describe alternatives you've considered

Out of various leaflet wrappers, RStudio's implementation is the closest.

Additional context

(Could attach one of html files created through RStudio's leaflet, if anyone needs it)

Implementation

Possibly, just to gauge the interest for now

Partire da map.save() e verificare come vengono selezionate le dipendenze default_js e default_css e scritte nell’HTML esportato. Definire l’opzione richiesta e verificare che JavaScript, CSS e icone siano incorporati come URI base64 inline, in modo che la mappa risultante funzioni senza risorse esterne o relative.