Auto DevOps docs should walk you through configuring an external database

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Type of issue

Problem to solve

Add documentation for Auto DevOps on how to configure an external database that isn't deployed by Auto DevOps. This is important for many users since the postgres DB deployed by Auto DevOps may not necessarily meet people's production requirements (see https://gitlab.com/gitlab-org/gitlab-ce/issues/58302)

Further details

A user can just set DATABASE_URL (and also POSTGRES_ENABLED=false to prevent Auto DevOps creating the postgres DB) as a CI variables now and it should just work but this is not documented and I have seen user confusion (https://gitlab.slack.com/archives/CB07X8AQ3/p1551108631080900)

Proposal

Add the docs

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