Cache lookup table

[dr0i]

Results from #1862:
We should not lookup isil2opac_hbzid.json but put it into the filesystem and make it hot-loadable (automatically reload this conf if it changes). We should then crontab (or webhook) to update isil2opac_hbzid.json.

Details:
web/conf/resources.conf:isil2opac_hbzid = "https://raw.githubusercontent.com/hbz/link-templates/master/isil2opac_hbzid.json"

Note: this is used in other projects , e.g. nwbib. Grep githubusercontent. Should be treated accordingly.

[TobiasNx]

@dr0i I am not sure if we need to do this, since we are enriching the source data with this information, see: #1888

[dr0i]

Ah , good to hear! The old lookup of websites every time was really not good.
Closing.