Boot quickly Arkindex

• use mkcert to build CA and cert instead of relying on our own CA
• run minimal services through docker compose from the backend
• use a single cantaloupe instance to expose multiple buckets, thus allowing ingestion
• document quick boot guide in README and remove deprecated Makefile commands
• add a docker-compose for building backend + frontend, fully replacing archi repo
• skip SSL verification against minio on ark.localhost and IIIF local servers
• update bootstrap command for new IIIF servers
• keep using the previously created docker volumes for easier dev migration
• Use RQ worker-pool to get multiple workers in parallel to support worker activities init