Show linked images

[faulhaber]

To test the problem of linked images, see: BETA manid 1110 (Madrid: Biblioteca Nacional de España, MSS/12793 V. 1) The link to the digital facsimile in the BNE is found in the INTERNET field BETA manid 1110 (pb.cog)

Based on issue#189

[jmformenti]

Try to find a new way to display images in PBUI, proposal:

1. Check if the URL is a simple image, in that case display directly the image. Function to check if an url is an image:

   
   function isImageUrl(url) {
   return new Promise((resolve) => {
   const img = new Image();
   img.onload = () => resolve(true);
   img.onerror = () => resolve(false);
   img.src = url;
   });
   }

isImageUrl('https://example.com/image.jpg').then(isImage => { console.log(isImage); // true o false });

2. Otherwise, redirect to the URL.