Remove preview files

packs/aoppoid/README.md

packs/apple-flower/README.md

packs/atelier-series-line-stickers/README.md

packs/autres/README.md

packs/bakaclub/README.md

packs/betterttv-gif/README.md

packs/betterttv/README.md

packs/bloodborne-gif/README.md

packs/bluerabredcat/README.md

packs/chronemotes-1/README.md

packs/chronemotes-2/README.md

packs/chronemotes-3/README.md

packs/chronemotes-4/README.md

packs/chronemotes-5/README.md

packs/crop/README.md

packs/eliteactu/README.md

packs/fachosphere/README.md

packs/fe-anna/README.md

packs/fe-dorothea/README.md

packs/fe-edelgard/README.md