metadata bookmarklet

[kdutia]

• [x] finish get_predicate_object API. Pull from SMG and Wiki APIs?
• [x] adapt bookmarklet from Heritage PIDs
• [x] add function to strip page URL so it matches the Heritage Connector format
• [x] sort out CSS
• [x] add google sheets link

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see:

• https://gist.github.com/aseemk/059f8b9a08e4590148b6484bb2781c4d
• https://pid-demonstrator.herokuapp.com/
  • bookmarklet JS

[kdutia]

waiting a couple of days for everyone to try it