New descriptions

Author: davidsklar99

cli/macrostrat/cli/database/migrations/people/main.sql

@@ -49,6 +49,6 @@ INSERT INTO ecosystem.roles (name, description) VALUES
   ('Student', 'Currently enrolled in an academic program'),
   ('Researcher', 'Conducts academic or applied research'),
   ('Developer', 'Writes and maintains software code'),
-  ('Postdoc', 'Postdoctoral researcher working on scholarly projects'),
-  ('Research Scientist', 'Professional researcher involved in scientific work'),
+  ('Leader', 'Leads research or development projects and mentors others'),
+  ('Collaborator', 'Contributes to joint projects'),
 ON CONFLICT (name) DO NOTHING;