Switch to absolute link for opensearch.xml
Switch to absolute link for opensearch.xml

It was indicated by @adam3smith that one has to use absolute links here, in order to work properly with Zotero.
Impactstory/citeas-api,Impactstory/sherlockoa,Impactstory/oadoi,Impactstory/oadoi,Impactstory/citeas-api,Impactstory/oadoi,Impactstory/sherlockoa,Impactstory/citeas-api