Restore game archive

[PeterJCLaw]

The old website had a page which detailed the games which have been played in the past. This served as a useful place for newcomers (volunteers, spectators and teams) to see what sorts of game are played, and so to get a good understanding of the competition itself.

For volunteers and teams it gives an idea of the scale of the challenge, so that they gain an understanding of how they can help and how hard it is to compete respectively.

For other visitors it provides a sense of scale (that we've been going as long as we have) as well as an idea of the challenge we present to the teams.

[PeterJCLaw]

Possibly related to #3

[PeterJCLaw]

Given the current structure of the website, this is actually going to live in the docs.
I'm currently in the process of extracting the relevant files from srweb. I'll put up a PR shortly.