curl --request DELETE \
  --url https://{server}/api/me/avatar/ \
  --cookie sessionid=

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "email": "jsmith@example.com",
  "name": "<string>",
  "is_system_admin": true,
  "is_repository_admin": true,
  "visible_outside_org": true,
  "email_pending_verification": "<string>",
  "root_collection_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "sole_organization_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "admin_organizations": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "member_count": 0,
      "description": "<string>",
      "whitelisted_email_domains": [
        "<string>"
      ],
      "globus_identity_provider_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
    }
  ],
  "memberships": [
    {
      "organization": {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "name": "<string>"
      }
    }
  ],
  "avatar_url": "<string>"
}