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

@@ -15,15 +15,12 @@
        theme: {
          transitions: window.location.port === '4488' ?  { create: () => 'none' } : {},
        },
-       windows: [{
-         manifestId: 'https://iiif.harvardartmuseums.org/manifests/object/299843',
-         canvasId: 'https://iiif.harvardartmuseums.org/manifests/object/299843/canvas/canvas-47174892',
-         thumbnailNavigationPosition: 'far-bottom',
-       },
+       windows: [
        {
-         manifestId: 'https://iiif.bodleian.ox.ac.uk/iiif/manifest/e32a277e-91e2-4a6d-8ba6-cc4bad230410.json',
+         manifestId: 'https://iiif.pages.tetras-libre.fr/IIIF-Publisher/manifests/folder2/multiple-manifest.json',
        }],
        catalog: [
+         { 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' },
          { manifestId: 'https://iiif.harvardartmuseums.org/manifests/object/299843' },
          { manifestId: "https://media.nga.gov/public/manifests/nga_highlights.json", provider: "National Gallery of Art"},