Generic archive information:

```json
{
  "uid": 1234,
  "name": "Archive Name",
  "domain": "example.com",
  "http": true,
  "https": true,
  "software": "foolfuuka",
  "boards": ["a"],
  "files": ["a"]
}
```

Most entries should be self-explanatory.

`uid` stands for "unique id", used on the client-side to save archive-specific settings.
The `uid` for a new archive should be an increment of the highest one,
make sure it does not overlap with an archive that previously died for example.

`software` can be `"foolfuuka"` or `"fuuka"` for example.

`files` is the list of boards whose files (images, videos, pdfs) are also archived, even temporarily, and not just thumbnails.