Remove location data from uploaded images

[HuxleyBerry]

Prerequisites

#75. #76 would also be nice to have first.

Issue

For privacy reasons, we should remove the location data from images so that other users cannot see the location at which images were taken. This blog post could be helpful for figuring out how to do that: https://www.gyford.com/phil/writing/2021/10/05/removing-exif-images-django/

[HuxleyBerry]

Actually, a nice way of doing this which may kill two birds with one stone is to use https://pypi.org/project/django-resized/.