500 Error on site. Cannot get license.

[rbruhn]

The site was running into 500 error because it was trying to get the license file from
https://licenses.opendefinition.org/licenses/groups/all.json
and the site was down.

Instead, I created a minimal license in the DK /etc directory. I also edited ckan.ini for:

licenses_group_url = file:///data/web/digitizationknowledge/etc/licenses.json

We should probably download the file from above when the external site is working again.
This is probably happening on dev when the license site is down.

[
  {
    "id": "cc-by",
    "title": "Creative Commons Attribution (CC BY 4.0)",
    "url": "https://creativecommons.org/licenses/by/4.0/"
  },
  {
    "id": "cc-by-sa",
    "title": "Creative Commons Attribution Share-Alike (CC BY-SA 4.0)",
    "url": "https://creativecommons.org/licenses/by-sa/4.0/"
  },
  {
    "id": "cc-by-nc",
    "title": "Creative Commons Attribution Non-Commercial (CC BY-NC 4.0)",
    "url": "https://creativecommons.org/licenses/by-nc/4.0/"
  },
  {
    "id": "cc-zero",
    "title": "Creative Commons Public Domain (CC0 1.0)",
    "url": "https://creativecommons.org/publicdomain/zero/1.0/"
  },
  {
    "id": "notspecified",
    "title": "License Not Specified",
    "url": ""
  }
]