Chant Detail View: We need to reimplement the displaying of concordances

[jacobdgm]

This feature was turned off by https://github.com/DDMAL/CantusDB/pull/1142, and we need to turn it back on again.

https://github.com/DDMAL/CantusDB/commit/206e85a2f0b527affb6e9a87d3cfea937a52d38a and https://github.com/DDMAL/CantusDB/commit/f4c1c1fe2ad156e8df96657f9c4c3bbbbfa2a943 were the commits responsible for removing this functionality.

We should seriously consider implementing this feature client-side:

• This will allow us to return the page with all of the relevant information from Cantus Database right away, and have the user's browser send the request to CI to display concordances and update the page once CI's response has come back
• If a bot is crawling our site, either
  • it will just request the page and parse our response, without executing any JavaScript
  • or, the bot will be the one responsible for sending the request to CI for concordances, and if it becomes a problem on CI's end, Jan can deal with it directly without us having to get involved.

We can use CI's https://cantusindex.org/json-cid/{CantusID} endpoint.

[jacobdgm]

Assigning this a priority of "high" - this is a feature that OldCantus had that we don't currently have.