Update data dump with reborn cards

[onecrayon]

• [x] Make sure the card data is up-to-date
  • [x] #22
  • [x] #19
  • [x] #18
• [x] Add decks for Master Set precons
  • [x] Add the base decks
  • [x] Update with descriptions from the legacy site
  • [x] Publish snapshots
• [ ] Write a script to automatically populate the precons for all remaining releases
  • [ ] Add the base deck with default description
  • [ ] Publish snapshots
• [x] Add new data dump that includes all Reborn cards and the preconstructed decks
  • [x] Retire the old dump
  • [x] Update the README instructions

[onecrayon]

Additional precons beyond the Master Set is pending the implementation of snapshot logic in #16.

[onecrayon]

I'm closing this, because I'm going to add the remaining releases through the deck-builder as a way to test it once it's up and running.