Update CODEOWNERS (#3047)

Christine is no longer working on the ocaml.org project, so I'm removing her from CODEOWNER to avoid spam.

Author: samoht

Diff for: .github/CODEOWNERS

@@ -1,7 +1,6 @@
-/data/ @christinerose
 /data/pages/governance.md @avsm
 /data/pages/privacy_policy.md @avsm
 /data/pages/carbon_footprint.md @avsm
 /data/tutorials/platform/op_00_principles.md @avsm
 /data/tutorials/platform/op_01_users.md @avsm
-/data/tutorials/guides/op_02_roadmap.md @avsm
+/data/tutorials/guides/op_02_roadmap.md @avsm