Some download links expired in Custom hitsound library

[h3oCharles]

https://github.com/ppy/osu-wiki/blob/master/wiki/Guides/Custom_hitsound_library/en.md

some puushes, luigihann's googie site, and one mediafire link

[sr229]

This does also pose a growing problem with some linked external resources aside from the aforementioned links. I think we should probably make a criteria that all links should use archived versions and backlink the original like how Wikipedia does it.

[Walavouchey]

the solution for this particular case is to compile a new set of hitsounds and preferably with more variety/options for sounds, thus rewriting the entire article

for now it could also be marked as outdated (or deleted - does anyone even use it?)

[sr229]

Tentatively we can mark it outdated for now until a replacement or a fix can be made.