docs: add .env.example for deploy script

Changed files
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.env.example
··· 1 - VITE_API_ENDPOINT=https://quickslice-production-9cf4.up.railway.app/graphql
··· 1 + BUNNY_API_KEY= 2 + BUNNY_STORAGE_PASSWORD= 3 + BUNNY_STORAGE_ZONE= 4 + BUNNY_STORAGE_HOST= 5 + BUNNY_PULLZONE_ID=