Prio 1 (for next version)
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provide index for nested directories, also if requested via url
gallery

Prio 2 (for future versions)
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google pagespeed insights https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Fwww.kneipenband.com%2Fwebbox%2F&tab=mobile
chromecast
player
i18n
list: more info if appropriate, number of files, limit(?)