Update the Redis settings documentation
Just wanted to get rid of the 3.x version and update the doc now that we support only 5.0+. Plus some other changes that make the page DRYer:
- Update info about Redis SSL
- Rearrange sections
- Point to GitLab docs to de-duplicate content
http://docs-preview-omnibus-redis-ssl.178.62.207.141.nip.io/omnibus/settings/redis.html