bug#42607: guix.gnu.org/videos don't play on iOS

[Tobias Geerinckx-Rice]

Guix,

A sympathetic PotentialUser reported that they were unable to play 
any of our home-page videos on their iPad.  Even Firefox didn't 
work.

Leo pointed out that we use the VP9 and Opus codecs — both of 
which are still not supported by Apple[0][1].  Nor is Vorbis.

nginx can easily sniff iOS/Macintosh user agents and serve them an 
inferior format to match, such as h264 with MP3 audio, which can 
both be encoded using free software in Guix.

Kind regards,

T G-R

[0]: https://caniuse.com/#feat=opus
[1]: https://caniuse.com/#search=vp9

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