Move file hosting to a dedicated server

[noahc3]

Many reasons to do this:

• Rawgit is shutting down.
• Some anti-viruses now block githack by default due to the service being used to host malware.
• Githack latency is spotty at best. On a bad day, you may be waiting 10 minutes just to download the standard SDFiles package.
• Workflow right now sucks, files need to be uploaded to three different services.
• Testing unreleased stuff (ex. unreleased SDFiles versions) is currently a nightmare since the files need to be hosted somewhere publicly accessible.
• A dedicated server would mean I can work on auto-updating packages.
• Hosting (sometimes huge) binaries on git is bad practice in general.

Dedicated servers cost money though, of which I don't have. Completing this assumes people would be willing to donate for the service.

[noahc3]

Backend is done (minus some optimizations and rate limiting) over at https://github.com/noahc3/SDSetup-backend.

VPS has been purchased with the Patreon donations, thanks guys!

Tweaks to the site should be relatively painless to get everything to use the new server. Hopefully in the next couple days.