Improve Favicon

[kelson42]

We have only the traditional favicon but many modern devices and OSes need the favicon in other format. See https://realfavicongenerator.net/favicon_checker?protocol=http&site=Farm.openzim.org

[rgaudin]

They don't need it but it provides a better experience for sure 👍

We should also consider the same thing for scrapers ; I can imagine the many pi+tablets deployments making a good use of homes creen shortcuts

[kelson42]

@rgaudin Have it on my plate to open obe ticket per scraper if necessary.

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