can rely on gravatar directly

README.md

@@ -144,11 +144,14 @@ If you want to add other fields, please ask to the website maintainer.
         "bio": "PhD Student at Berger-Levrault on GUI migration",
         "github": "https://github.com/badetitou",
         "twitter": "https://twitter.com/badetitou",
-        "image": "https://avatars.githubusercontent.com/u/6225039"
+        "image": "https://avatars.githubusercontent.com/u/6225039",
+        "gravatar-hash": "ab4070086241400a4a428bf8994f05e0"
     }
 }
 ```
 
+> As for Benoit, you can use your gravatar-hash instead of a image.
+
 #### Test your draft locally
 
 When you ended to write your draft, you can start jekyll locally to visualize your draft as a post.

_data/authors.json

@@ -18,7 +18,8 @@
         "linkedin": "https://www.linkedin.com/in/benoitverhaeghe/",
         "personnal-website": "https://badetitou.github.io/",
         "orcid": "https://orcid.org/0000-0002-4588-2698",
-        "image": "https://avatars.githubusercontent.com/u/6225039"
+        "image": "https://avatars.githubusercontent.com/u/6225039",
+        "gravatar-hash": "ab4070086241400a4a428bf8994f05e0"
     },
     "Anne Etien": {
         "name": "Anne Etien",

_includes/profile_card.html

@@ -4,7 +4,11 @@
     <header>
       <!-- here’s the avatar -->
       <a target="_blank" href="#">
-        <img src="{{ author.image }}" class="hoverZoomLink no-lightense">
+        {% if author.gravatar-hash %}
+          <img src="https://gravatar.com/avatar/{{ author.gravatar-hash }}?size=256" class="hoverZoomLink no-lightense">
+        {% elsif author.image %}
+          <img src="{{ author.image }}" class="hoverZoomLink no-lightense">
+        {% endif %}
       </a>
 
       <!-- the username -->