Add missing route directories

[jerone]

We have some dead route directories that result in 404's. We can limit them by making redirects.

e.g. https://openuserjs.org/user/preferences -> https://openuserjs.org/user/

I also cleaned up some routes.

Question: should we use the function app_route for all routes? I'm wondering if it causes overhead...

[Martii]

What happens if someone wants to make a User Script on those urls? Are we killing any future options?

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Btw this probably applies to #135

[jerone]

What happens if someone wants to make a User Script on those urls?

I only added one route to the scripts/ directory; the one with an username but without a namespace.
The remaining are part of OUJS urls convention.

Are we killing any future options?

Thus ... no

[sizzlemctwizzle]

should we use the function app_route for all routes

Yes, it'll make the conversion to Express 4.x (whenever that happens) smoother.

I'm +1 on this (especially the /scripts/:username -> /users/:username/scripts).