Feature: Redirect ostrakon.xyz to topsters.org and transfer data

[camdendotlol]

The redirect would be simple enough, but charts are stored in the user's browser on a per-domain basis and I don't want people to lose their charts.

I've read before about a way to load the old site in an iframe and run some JS that transfers the data to the new site. There would need to be something like

if (window.location.hostname.includes('ostrakon')) {
  sendCharts()
} else {
  recieveCharts()
}

For a recent example, I think this is how Wordle transferred everyone's data when it moved to nytimes.com.

Alternatively, since the import/export feature was added, I could prompt users to export their charts with a deadline.

[camdendotlol]

Now that users can export and import charts, it would be easier to just put up a notice for a while telling people to migrate their charts themselves with a scheduled shutdown date for the old domain.