correct link (#502)

Author: antoine-palazz

content/getting-started/index.qmd

@@ -8,7 +8,7 @@ description: |
 slug: introduction
 type: book
 weight: 10
-image: https://ensae-reproductibilite.github.io/website/chapters/images/egg.jpg
+image: https://ensae-reproductibilite.github.io/website/egg.jpg
 bibliography: "../../reference.bib"
 ---