update links for team members

_data/dynare_team.yml

@@ -11,7 +11,7 @@
 - name: Michel Juillard
   affiliation: Banque de France
   img: /assets/images/team/michel.jpeg
-  webpage:
+  webpage: https://ideas.repec.org/e/pju1.html#research
 
 - name: Sumudu Kankanamge
   affiliation: Toulouse School of Economics
@@ -31,7 +31,7 @@
 - name: Ferhat Mihoubi
   affiliation: Université Paris-Est Créteil
   img: /assets/images/team/ferhat.jpg
-  webpage:
+  webpage: http://www.erudite.univ-paris-est.fr/lequipe/enseignants-chercheurs/mihoubi-ferhat/
 
 - name: Johannes Pfeifer
   affiliation: University of Cologne
@@ -41,7 +41,7 @@
 - name: Marco Ratto
   affiliation: EC Joint Research Centre
   img: /assets/images/team/marco.jpg
-  webpage:
+  webpage: https://ideas.repec.org/f/pra217.html#research
 
 - name: Sébastien Villemot
   affiliation: Cepremap