[Issue 15449] CSS and JS files should be minified and concatenated

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15449

--- Comment #2 from Seb <greensunny12 at gmail.com> ---
https://github.com/dlang/dlang.org/pull/2311 for the minification.

I opened https://issues.dlang.org/show_bug.cgi?id=18695 to track the
concatenation (might be trickier because not everything is needed on every
page)

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