Move d8 into another folder

Hi,

With d7 and d6 it was easy to move drupal to anonther folder. I did now the same with D8, but only the frontpage is displayed well. Wat must i do? I want to move it from roerstreekmuseum.nl/d8 to roerstreekmuseum.nl. I did it by moving all the files in the d8-folder to the root-folder… but it doesn’t work.

Thanks,
Fred

Drupal version: 


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