Manifest side to side

This reverts commit afa0281b.

Use this manifest for testing : https://anthony.pages.tetras-libre.fr/demo-content/manifests/test5.json

Closes #17 (closed)

__tests__/integration/mirador/index.html

@@ -17,7 +17,7 @@
        },
        windows: [
        {
-         manifestId: 'https://iiif.pages.tetras-libre.fr/IIIF-Publisher/manifests/folder2/multiple-manifest.json',
+         manifestId: 'https://iiif.bodleian.ox.ac.uk/iiif/manifest/e32a277e-91e2-4a6d-8ba6-cc4bad230410.json',
        }],
        catalog: [
          { manifestId: 'https://iiif.pages.tetras-libre.fr/IIIF-Publisher/manifests/COESO/COESO_Project_Home_manifest.json'},