Set max carousel img height

Pictures that have a format like 16:9 use very much space of the screen. So if there is no wide-formate image available, this change is useful to make at least at bit of the text visible without scrolling.

added 40 commits

• 3aec5dff...4a42e22f - 39 commits from branch master
• b30dd2d2 - Set max-height for img in carousel

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Tested compatibility with hacknfun.org: Because there a w-100 class is used, images are now stretched horizontally. This could be solved by either removing that class on each site or increasing the max-height of my change to 70vh. I'd prefer the second option, because it still leaves some space for the text, while not affecting images that already have a relatively wide format.

added 1 commit

• 5e21279f - Set max-height for img in carousel

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Found a even better solution now: That max-height: 70vh ensures that a picture can never fill the whole screen. To prevent images from being stretched, but also from being cut e.g. on mobile devices, one can set themw-100 class, to only set a max-with instead of a fixed one.

requested review from @robert

Changes do not work as intended currently.

merged