[docs] add note to readme about editing the unversioned directory (used to be in expo-docs PR template)
[docs] add note to readme about editing the unversioned directory (used to be in expo-docs PR template)

exponentjs/exponent,exponent/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponentjs/exponent,exponentjs/exponent,exponentjs/exponent,exponentjs/exponent,exponentjs/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent