Autodetect repo to launch based on HTTP referer

[yuvipanda]

Given #891 has been in draft for a few years, I wanted to memorialize the feature it is trying to add in this issue so we can close the PR.

We could add an /autodetect endpoint that would detect the URL to launch based on the referer, and redirect the user to the correct full URL.

However, I think there's been some changes in which links get Referer passed and which don't in the last few years, so I'm not sure what the feasibility of this is.

[manics]

I don't think it's worth doing any more. Browser security and anti-tracking protections have increased a lot to the point where it wouldn't be reliable.

Auto detecting a pasted URL is nice though (covered in another issue).

[yuvipanda]

Great, let's close this as WONTFIX.