New TF-TG resources in BioGateway

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We have replaced the TF-TG resources previously available in BioGateway (TRRUST, ExTRI, CytReg, Signor, GEREDB, HTRIdb, and TFactS) with the CollecTRI resource (DOI: 10.1093/nar/gkad841) and TFLink (DOI: 10.1093/database/baac083).