This also adds a comment wrt upscaling small images. See
https://github.com/python-pillow/Pillow/blob/bc354d10c2610be10ca27c63fac97b62cd26ee3b/PIL/Image.py#L1800

This might be a useful feature before publishing albums publically,
to review if everything looks ok.

This modifies the fancybox plugin to support the rotation.
To achieve this properly, we switch to using the non-packed version.
Future improvements might include automatically minifying JS,
as well as upstreaming this fix. However, the Fancybox repository
seems inactive and has numerous unanswered pull requests.