add umap viewer

Author: jamesamcl

frontend/.env

@@ -14,3 +14,5 @@ REACT_APP_SPOT_ZOOMA=https://www.ebi.ac.uk/spot/zooma
 REACT_APP_SPOT_OLS4_REPO=https://github.com/EBISPOT/ols4
 REACT_APP_SPOT_OLS_ANNOUNCE=https://listserver.ebi.ac.uk/mailman/listinfo/ols-announce
 REACT_APP_OBO_FOUNDRY_REPO_RAW=https://raw.githubusercontent.com/OBOFoundry/OBOFoundry.github.io/master
+REACT_APP_UMAP_URL=https://ftp.ebi.ac.uk/pub/databases/spot/ols_embeddings/latest/umap/
+