blocklistConfig.json in today's reality

[ignoramous]

Now that the blocklists cat is out of the bag, time to get rid of an unused field and introduce a new one.

• Remove unused field: uname. It was included for book-keeping purposes from when we tracked nextdns/metadata for reasons that don't exist anymore.

• Add new optional string field: status, which can assume dead, alive, unknown to depict the state of the blocklist. Since we can't recycle values once assigned (unless version is bumped up), we'd have to keep those entries around for book-keeping purposes.

• Add fields for homepage and a short description of the blocklist.

• Overall, though, blocklistConfig.json must also capture its own version, so that's another field to introduce at the top-level.