Update _index.md: card10 handout closed

_index.md

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 title: Home
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-## card10 handout: You can exchange white vouchers against card10s at the card10 assembly at Day1, 18:00.
+## card10 handout: Card10 handout is closed. Not sure when it will open again, but not before Day2 - 16:00
 ## current firmware version: Broccoli (as of day1-19:00)
 It is very easy to [update your card10 firmware](/en/firmwareupdate) with just a USB-C cable. The update instructions
 also contain a list of the existing firmware releases.