use PersistentVolumeClaim to create a persistent volume for each local service (mongo, minio, redis) when running in a cloud setup
if cloud-specified volume storage class not specified, create default hostPath volume (eg. for minikube)
lint: add default icon for chart
- working apis for adding crawls, removing crawls in mongo, mapped to k8s cronjobs
- more complete crawl spec
- option to start on-demand job from cronjobs
- optional minio in separate deployment/service
