add D in FAQ on influences on language design

[timotheecour]

lots of reasons:
CTFE
static if (aka when)
nim's templates are closest to D templates amongst other languages

[Araq]

CTFE is the natural solution for imperative AST construction in Nim's macros, it was there from day one. I don't remember if I've seen it in D before. Nim's template are quasi-quotes and have little to do with D's. static if -- maybe, but I think C's preprocessor #if was the major influence here.

Either way, later C# was an influence with the => syntax for lambdas, Golang for defer and recently Rust with its lifetime tracking. I think we need to change the wording of that paragraph without introducing more and more languages. :-)

Also it says "in order of impact" and C++ and Python had much more impact on Nim than D.

[dom96]

also, this isn't where the website is anymore. We need to remove it from this repo. It's now in here: https://github.com/nim-lang/website/