Document default credentials for each package

When setting up each package without SSO they typically have a default user/password, either hardcoded or autogenerated. These users/passwords are sometimes documented in the individual package repos but not always, and not in consistent docs locations.

Note: some packages store creds in secrets/configmaps, some output them in pod logs, some use other mechanisms. Do your best to simplify grabbing of the password with a single command (example for when stored in pod logs, use kubectl logs and grep).

Completion of this issue requires:

• single doc in BigBang repo under docs that includes defaults (user and password) for every package (where applicable, some apps don't have auth)
• for credentials in secrets/configmaps/other k8s objects, one-line commands that get the plaintext password (see elastic as an example, inline b64 decode)
• for passwords that are not auto-generated, include the password that is set by default and where possible the helm value that overrides the password