Serve hotkeys-iframe.js from a path from Hedgedoc to circumvent CSP #87
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The Hedgedoc CSP is a good thing to have enabled.
But it breaks the JS injection done by CTFNote.
So now we just lie to the frontend that the file is hosted by Hedgedoc while it actually is hosted by CTFNote.
This should circumvent the CSP and allow script execution inside the iframe, even when the CSP is enabled.