Add type to MediaObject

[sekaiking]

After this curaOS/contracts#3 gets implemented we should add type="image" to MediaObject components in the frontend, because now it assume all medias are HTML

And because of that, they get displayed wrong

[bestatigen]

It's working fine at the moment? @achrafismyname

[sekaiking]

Yes and no, some NFTs got minted using this PR #194 and are causing this problem.
But it's not a big problem, this mainly need to be implemented after #194 gets merged.