Migrate to Anki Deck Manager

[axelboc]

• https://github.com/OnkelTem/anki-dm
• Translate deck to Russian #62 (comment)

[axelboc]

@OnkelTem just letting you know the import worked like a charm and the deck builds perfectly. I had no problem importing, studying, then re-importing the deck into Anki! As you mention in your README, I lost all my progress after the first import, but I didn't lose my progress on subsequent imports, which is perfect. The deck configuration gets overridden, but this is a long-standing CrowdAnki issue, which I've just decided to report.

Anyway, thanks a lot. I'll keep going with the migration. I still need to update the README and the decks' descriptions. I'll release this as v3 since people will lose progress if they upgrade.