Update social media links

Author: SylvainCorlay

about.html

@@ -266,14 +266,14 @@
   - name: Sylvain Corlay
     photo: SylvainCorlay.png
     affiliation: QuantStack
-    gh_handle: sylvaincorlay
+    gh_handle: SylvainCorlay
   - name: Afshin Darian
     photo: AfshinDarian.jpeg
     affiliation: QuantStack
     gh_handle: afshin
   - name: Jonathan Frederic
     photo: JonathanFrederic.jpeg
-    gh_handle: 'jdfreder'
+    gh_handle: jdfreder
   - name: Brian Granger
     photo: BrianGranger.jpeg
     affiliation: Amazon Web Services
@@ -372,6 +372,8 @@
     photo: SylvainCorlay.png
     affiliation: QuantStack
     gh_handle: sylvaincorlay
+    linkedin: https://www.linkedin.com/in/sylvaincorlay/
+    twitter_handle: SylvainCorlay
     subproject: Voilà
   - name: Itay Dafna
     photo: ItayDafna.jpg