Replace complex SVGs for some fide-fed flags

[allanjoseph98]

Sergio has already optimized the SVGs in public/images/fide-fed. However, some SVGs are too complex to be optimised further.
On a fresh load for a broadcast with lots of players, users are downloading almost 200kB of just flags. That's almost as much as our JS. Users should not be downloading such large SVGs for a 15px x 10px img. We should replace them with simpler versions.

There are ~30 flags that are >10kB. For comparison, the PNG flags that are displayed in user profiles (images/flag) are all 2kB or less (except one).

[SergioGlorias]

note: FIDE flags are also used at lichess.org/fide
There are even some optimizations that can be done by hand
which costs a little more time
But of course it's not easy

and leaving a static image, depending on what is done, can look terrible