Update index.md

docs/index.md

-![](https://gitlab.fabcloud.org/fibasile/mkdocs/raw/master/docs/images/sample-pic-2.jpeg)
+<div class="sketchfab-embed-wrapper"><iframe width="640" height="480" src="https://sketchfab.com/models/7e01bff42b2d47fab640503bcef071e6/embed" frameborder="0" allow="autoplay; fullscreen; vr" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe>
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+<p style="font-size: 13px; font-weight: normal; margin: 5px; color: #4A4A4A;">
+    <a href="https://sketchfab.com/models/7e01bff42b2d47fab640503bcef071e6?utm_medium=embed&utm_source=website&utm_campaign=share-popup" target="_blank" style="font-weight: bold; color: #1CAAD9;">Nucleus - Cell Organelles</a>
+    by <a href="https://sketchfab.com/objects1?utm_medium=embed&utm_source=website&utm_campaign=share-popup" target="_blank" style="font-weight: bold; color: #1CAAD9;">Vida Systems</a>
+    on <a href="https://sketchfab.com?utm_medium=embed&utm_source=website&utm_campaign=share-popup" target="_blank" style="font-weight: bold; color: #1CAAD9;">Sketchfab</a>
+</p>
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