Remove preview files

packs/fe-hilda/README.md

packs/fe-marianne/README.md

packs/francais/README.md

packs/ganbare-doukichan/README.md

packs/japanesekitty/README.md

packs/jouker/README.md

packs/jvc/README.md

packs/kumiko/README.md

packs/larry/README.md

packs/logh/README.md

packs/macron-demon/README.md

packs/madoka-magica/README.md

packs/madokamisc/README.md

packs/magia-record/README.md

packs/mahoyo/README.md

packs/mericshololivepack/README.md

packs/monogatari-series/README.md

packs/overwatch/README.md

packs/pack-among-us/README.md

packs/pack-fire-emblem/README.md