OpenCOR logo: use the Physiome theme (closes #483) [ci skip].
OpenCOR logo: use the Physiome theme (closes #483) [ci skip].

mirams/opencor,mirams/opencor,Fairly/opencor,Fairly/opencor,mirams/opencor,mirams/opencor,Fairly/opencor,Fairly/opencor,mirams/opencor,Fairly/opencor