Add nlm_thumb_logo for NLM branding.
Add nlm_thumb_logo for NLM branding.

IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service,IHTSDO/OTF-Mapping-Service