Preparatory steps for installation not obvious

[oughnic]

A couple of organisations have separately tripped up on failing to change the mandatory authority from the default value. The documentation fails to make it clear that the authority is only configured on the very first start of an endpoint. See https://maurodatamapper.github.io/installing/configuring/mdm-core-config/

Suggested action:

1. Update the Installation and Administration section to include an additional section before Installation for preparatory steps including steps to set the configuration variables
2. Make it clear what the impact of failing to set the authority before initial install is
3. Review all additional configuration variables to identify any additional compulsory overrides where the default option prevents functionality
4. Amend https://maurodatamapper.github.io/installing/docker-install/ to make it clear that the config for authority (and other parameters) must be done before the install is first run.

[Sunspark]

Definitely echo point 2 - The install works fine with the defaults, but is broken in non-obvious ways.

Possible mitigations :

• add something in the build scripts to generate a name/ url if they are not overridden (as I understand it, the name/ url actually don't matter, so long as they are unique).
• add links in the docs to docs on how to change the defaults after set-up.