added preliminary roles for people. Need @mschaller to fix this up.

data/contact.yaml

 people: [
   {
     name: Dr. Matthieu Schaller,
+    role: Project PI (Astro),
   },
   {
     name: Dr. Pedro Gonnet,
-    role: ROLE,
+    role: Project PI (CompSci),
   },
   {
-    name: Mr. Aidan Chalk,
+    name: Dr. Aidan Chalk,
+    role: Computer Scientist,
   },
   {
     name: Mr. James S. Willis,
+    role: Computer Scientist,
   },
   {
     name: Dr. Peter Draper,
+    role: Computer Scientist,
   },
   {
     name: Pr. Richard G. Bower,
+    role: Astronomer,
   },
   {
     name: Dr. Bert Vandenbroucke,
-  }
+    role: Code Developer,
+  },
   {
     name: Mr. Stefan Arridge,
+    role: PhD Student,
   },
   {
     name: Mr. Joshua Borrow,
+    role: PhD Student,
   },
   {
     name: Pr. Tom Theuns,
+    role: Astronomer,
   },
   {
     name: Dr. Yves Revaz,
+    role: Astronomer,
   },
   {
     name: Mr. Loic Hausammann,
+    role: Astronomer,
   },
   {
     name: Mr. Angus Lepper,