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add oaktrust favicon

erinspace/scrapi,mehanig/scrapi,alexgarciac/scrapi,CenterForOpenScience/scrapi,CenterForOpenScience/scrapi,erinspace/scrapi,felliott/scrapi,jeffreyliu3230/scrapi,felliott/scrapi,mehanig/scrapi,fabianvf/scrapi,fabianvf/scrapi