Use sRGB Color Profile when converting images
With the conversion done when uploading or fetching an image we also
lose any embedded color profiles. [This leads to images possibly not rendered
properly in the browsers.][1] To fix the issue we tell imagemagick to render
the image from the embedded color profile to sRGB, which is the color
space used by most browsers.
RT_sRGB.icm is taken from the [RawTherapee repository][2] and is licensed as Public Domain.
[1]: https://meta.discourse.org/t/image-embedded-color-profile/40519
[2]: https://github.com/Beep6581/RawTherapee/blob/master/rtdata/iccprofiles/output/RT_sRGB.icm
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