replace nekotools server with npx http-server for local development

[ninjamuffin99]

dox already assumes you have nodejs of some sort setup (requires lix), so this PR changes the nekotools server command that loads up the webserver for development purposes, and instead uses http-server (which is what lime uses, albeit as an included binary rather than npx)

Ideally it can be a more haxe solution (snake-server would be a good candidate, but it wasn't playing too nicely with lix for me...)

This PR should allow a bit easier development, as well as less reliance on neko

[Simn]

I generally agree with removing neko dependencies, but I'm not sure if replacing it with a nodejs dependency is that much progress... But then again I don't think I even noticed that Make.hx file before so if this makes your life easier I see no reason not to merge this!