[PATCH] Add image/avif to conf/mime.types

[André Rømcke]

Format is stable and broader AVIF support (& likely also adoption) is incoming:

- About 1/2 size compared to jpeg, 2/3 of webp, and roughly 1/1 with JPEG XL*
- Already supported in Chrome and Firefox:
    - Also in Chromium** so soon in Edge, Opera, ...
    - And apparently landed in Webkit***


Kind regards.


* JPEG XL bitstream is frozen, but still work in progress & not
supported out of the box:
- https://en.wikipedia.org/wiki/JPEG_XL
- https://caniuse.com/jpegxl

** https://bugs.chromium.org/p/chromium/issues/detail?id=960620

*** https://bugs.webkit.org/show_bug.cgi?id=207750
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