Remove preview files

packs/pack-hanayo/README.md

packs/pack-hii/README.md

packs/pack-iiens/README.md

packs/pack-little-witch-academia/README.md

packs/pack-magicienne-des-tenebres/README.md

packs/pepe/README.md

packs/pepetop/README.md

packs/pikachudetective/README.md

packs/popocolorin/README.md

packs/prettysailormoon/README.md

packs/pusheen/README.md

packs/pusheen02/README.md

packs/qlf/README.md

packs/raoult/README.md

packs/risitas/README.md

packs/shotacollectionpack/README.md

packs/star-wars/README.md

packs/trails-in-the-sky/README.md

packs/twitch/README.md

packs/weeb/README.md