Change logo image names

Otherwise they trigger ad filtering in ublock :(

about.md

@@ -35,7 +35,7 @@ We work on great tools and hardware for photographers, making beautiful pictures
 
 <div align=center>
   <a href="http://twitter.com/freling">
-    <img src="/images/twitter_logo.png" alt="Twitter" style="height:40px;">
+    <img src="/images/touitheur_logo.png" style="height:40px;">
   </a>
   <a href="http://gitlab.com/ffreling">
     <img src="/images/gitlab_logo.png" alt="GitLab" style="height:40px;">
@@ -44,6 +44,6 @@ We work on great tools and hardware for photographers, making beautiful pictures
     <img src="/images/github_logo.png" alt="GitHub" style="height:40px;">
   </a>
   <a href="http://fr.linkedin.com/in/ffreling">
-    <img src="/images/linkedin_logo.png" alt="LinkedIn" style="height:40px;">
+    <img src="/images/leencktyn_logo.png" style="height:40px;">
   </a>
 </div>