chore: add gray-matter dependency for markdown frontmatter parsing

public/images/people/alexandre_hannelas/index.md

@@ -1,13 +1,13 @@
 ---
-title: Alexandre Hannelas
+name: Alexandre Hannelas
 weight: 3
-description: Finance Manager
+excerpt: Finance Manager
+title: Finance Manager
 taxonomies:
     people: [alexandre_hannelas]
     memberships: []
     categories: []
 extra:
-    imgPath: alexandre_hannelas.jpeg
     organizations: []
     countries: [France]
     cities: [Aix-en-Provence]
@@ -17,6 +17,7 @@ extra:
         github: https://github.com/AlexandreHannelas,
         websites: https://threefold.io/,
     }
+image: ./alexandre_hannelas.jpeg
 ---
 
 Capable finance specialist with a deep passion in driving lean and innovative business models.