installer: generate documentation for configuration

[Pothulapati]

Is your feature request related to a problem? Please describe

Currently, Config is the spec through which users pass configuration into the installer but it isn't
documented. This means users have to check the golang types directly to understand what
all options are even allowed.

Describe the behaviour you'd like

We should be generating the documentation directly from the golang structs. Probably, Having them
as comments and rendering them out into a table in config.md should be good.

Additional context

Similar projects around this:

• Helm Doc Generator from values.yaml
• Generating Yaml spec from go structs