Remove the warm-reloading README section (#2499)
Remove the warm-reloading README section (#2499)

Warm-reloading is not even used by the core Pontoon devs.
It also has poor browser support and requires hacking.
mozilla/pontoon,mathjazz/pontoon,mozilla/pontoon,mozilla/pontoon,mathjazz/pontoon,mathjazz/pontoon,mathjazz/pontoon,mozilla/pontoon,mozilla/pontoon,mathjazz/pontoon