render Json-LD in Dataset Page

[ekraffmiller]

What this PR does / why we need it:
Adds json-ld to header of View Dataset page.

Which issue(s) this PR closes:

Closes #350

Special notes for your reviewer:
This PR is a proof of concept, to test that the json-ld is available in a deployed app. The json-ld is viewable in the browser view of the DOM, and has dynamic data based on the current dataset, but we need to test on a webpage that can be run in https://search.google.com/test/rich-results

Suggestions on how to test this:
Deploy to beta.dataverse.org and do the rich-results test.

Does this PR introduce a user interface change? If mockups are available, please link/include them here:
no
Is there a release notes update needed for this change?:
no
Additional documentation:

[coveralls]

coverage: 98.403% (+0.6%) from 97.805%
when pulling 1611065 on feature/350-json-ld
into 0d1d97e on develop.

[pdurbin]

Deploy to beta.dataverse.org and do the rich-results test.

It would be nice for beta to only run merged code but whatever works for now!

Maybe we need an alpha server. 😄

[ekraffmiller]

Deploy to beta.dataverse.org and do the rich-results test.

It would be nice for beta to only run merged code but whatever works for now!

Maybe we need an alpha server. 😄

@pdurbin yes, I agree we don't want to do this generally, I just wanted to deploy this to beta so that we could run google rich results, to test that the json-ld is readable in the page. We did the test, and found out that the containerized dataverse image runs with robots.txt disallowing all access. So that is the next thing to figure out for this ticket :)

[ekraffmiller]

I created a Dataverse issue for customizing robots.txt: IQSS/dataverse#10593