cross-origin popups

[longhotsummer]

The idea here is that a user can hover over an FRBR URI link on, say, africanlii.org. It will try to fetch the popup for the link on africanlii.org. If AfricanLII doesn't have the document, it'll use the resolver to determine which LII does, and send a redirect to the popup on that LII. The browser follows the redirect and CORS permits the request.

Additionally, if it's a CORS/offsite request, then the popup includes the partner site's name.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ OperationalError: SSL connection has been closed unexpectedly /p/{partner}/e/popup/{frbr_uri} View Issue
• ‼️ OperationalError: Timed-out waiting to acquire database connection. /p/{partner}/e/popup/{frbr_uri} View Issue
• ‼️ InterfaceError: connection already closed /p/{partner}/e/popup/{frbr_uri} View Issue

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