Expand the archive to include a record of builds older than the main site

[MayImilae]

Ever since the move to the current site, the main site has provided a great record of the changes that have come along. And thanks to the recent fix, it's now easier to access than ever! However, everything prior to the site move is not available on the main site. That means that for a tester to work in anything before 3.5, they have to go to that site which shall not be named for an easy to use database. Yea, ew! And even that only goes back to r4xxx anyway...

However, all of the information is on github already! All of the old svn information was converted to git and transferred to github. Here's the very first commit of open source dolphin, right here on github -> dolphin-emu/dolphin@5599855

But going through page after page after page is very difficult to nearly impossible for anyone who doesn't know the precise git hash of what they are wanting to find. And github doesn't allow google's spider to crawl the commits, which means you can't google for specific things to get around github's limitations. Allowing the mainsite to go further back as an archive would be fantastic for record keeping and extreme testing purposes, as well benefiting the issue tracker and wiki. The information is all there on github, with contributor, svn number, description, on and on. It would just need someone to adjust the main site to be able to read it, and link it in with the numbering system! And tying that into https://dl.dolphin-emu.org/oldbuilds/ would be great too.