Update firstpost.md

2021-10-15 23:39:38 +01:00 · 2021-10-15 23:39:38 +01:00 · 881daf1e94
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 title:  Introduction to Raspberry Pi
 description: This is my first post, it is an introduction to Raspberry Pi.
-date: 2021/10/15
+date: 2021-10-15
 tags:
  - first post
  - raspberry pi