add metadata in json+ld format in the head of the doi landing page. It fixes #63.
use datahub instead of kolla, center beamline table between vertical bars, use post method to avoid trailing question mark. It fixes #59.
send constants to template. Test with ES and DC doi from 10.5072 prefix. recompile for production. It fixes #57
change the target page to display when the user clicks to access the data and the doi is for data collection. It fixes icat/doi-landing-page#57.