Make a nice 404 page for /fide not found

[TBestLittleHelper]

Sometimes a player in broadcast will have a Fide ID, on the FIDE website. But the Fide ID is not yet part of Lichess' /fide page. When you click on the clickable player name in the broadcast you get the generic 404 page.

A fide 404 page, with some text should work. A quick draft :

We could not find anyone with this FIDE ID, make sure the ID number is correct. If the player appear on the official FIDE website, then the player was not included in the latest rating export from FIDE. Official exports are provided once a month and includes players who have at least one official rating.

Note : Not sure if we are using legacy format or not. Seems like players without any rating might be excluded from the modern export.
https://ratings.fide.com/download_lists.phtml

EDIT: To be clear : The 404 link from broadcast is https://lichess.org/fide/1/redirect where the 1 is the fideID
Searching for an ID does look ok : https://lichess.org/fide?q=99999999999 even if the ID can't be found

[Jaishree2310]

@kraktus @TBestLittleHelper Can you please assign this to me?
Thanks!

[ornicar]

It's been 3 days. My turn.

[ornicar]

we use http://ratings.fide.com/download/players_list.zip

https://github.com/lichess-org/lila/blob/b94531f5674ae930d87c6d15a806a0428596e404/modules/fide/src/main/FidePlayerSync.scala