docs: Update README to match GitHub format

Author: bbfh-dev

README.md

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 # 🫧 Bubblellaneous Pack
 
+[![thumbnail](https://i.ytimg.com/vi/RGn_skcWKsg/mqdefault.jpg)](https://youtu.be/RGn_skcWKsg)
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 This Minecraft pack adds Furniture, Technology, Food & Miscellaneous blocks and items.
 
 To use it you must [install the data pack](https://minecraft.wiki/w/Data_pack#Usage) in your world. All players playing on your server must have [the resource pack installed](https://minecraft.wiki/w/Resource_pack#Java_Edition).