[Branch angular-11 | Explore]: environments/: Updated "datasourcesAPI" from "https://beta.services.openaire.eu/openaire/ds/search/" (post) to "https://beta.services.openaire.eu/openaire/ds/api/" (get).
[Branch angular-11 | Explore]: environments/: Updated "datasourcesAPI" from "https://beta.services.openaire.eu/openaire/ds/search/" (post) to "https://beta.services.openaire.eu/openaire/ds/api/" (get).