create data/instances.php to demonstrate out-of-code configuration, and use it to dynamically generate the instance list (#8)

see title.
the workflow here (i.e. a file data/*.php, which only has a data structure and is used to generate content elsewhere) could also be used for easier per-instance customization.

[you can see what this looks like live here](https://4get.silly.computer/about)

Co-authored-by: cynic <kurisufag1@gmail.com>
Reviewed-on: https://git.lolcat.ca/lolcat/4get/pulls/8
Co-authored-by: cynic <admin@cynic.moe>
Co-committed-by: cynic <admin@cynic.moe>

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