Allowing the ontology links on associations page to open in a new tab

[buniello]

We got feedback from the AOTF paper, one of them mentioning:

1) Making the necessary changes to the clickable ontology and ICD-11 links on the top area of the Associations page (https://platform.opentargets.org/disease/EFO_0005774/associations) to allow links to open in a new tab. This will improve user experience when exploring ontologies, especially for EFO links. Example: If a user clicks on EFO_0005774/ICD10 to view the details in Ontology Look Up Service (OLS). The OLS website overrides the Open Targets website, and the OLS website has some javascript that disables the back button of the browser, hence the user can't return to the Open Targets website.

[prashantuniyal02]

These links should open in a new tab for target/drug/disease pages.