move Pier to alumni (#2781)

* move Pier to alumni

* add Pier to alumni

---------

Co-authored-by: Darren A. Natale <nataled@users.noreply.github.com>

Author: nlharris

_data/alumni.yml

@@ -10,6 +10,10 @@ members:
   name: Mathias Brochhausen
   orcid: 0000-0003-1834-3856
   wikidata: Q57161944
+- github: pbuttigieg
+  name: Pier Luigi Buttigieg
+  orcid: 0000-0002-4366-3088
+  wikidata: Q41566750
 - github: mcourtot
   link: http://purl.org/net/mcourtot
   name: Melanie Courtot

_data/operations.yml

@@ -198,16 +198,6 @@ members:
   name: Paul Fabry
   orcid: 0000-0002-3336-2476
   wikidata: Q108555457
-- affiliation:
-    name: Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
-    ror: 032e6b942
-  country: Germany
-  github: pbuttigieg
-  groups:
-  - outreach
-  name: Pier Luigi Buttigieg
-  orcid: 0000-0002-4366-3088
-  wikidata: Q41566750
 - affiliation:
     name: La Jolla Institute for Immunology, La Jolla, CA
     ror: 05vkpd318