Merge torrust#62: Grafana dashboard snapshots

daa6635 chore: grafana dashboard snapshots (Jose Celano)

Pull request description:

  I'm making backups of the Grafana dashboard whenever it is updated, so other users can use it.

ACKs for top commit:
  josecelano:
    ACK daa6635

Tree-SHA512: a3f6ac9cb1a3b27eb42164fdeeb7f448b05de2e1c04836ca69ae96a367aa67514a00cfac9eba8528e0608c6377d63968241620dac9b24ba5e0b306ac106434a2

Author: josecelano