Add config options table to README

[mtrezza]

New Feature / Enhancement Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.

Current Limitation

The dashboard README is verbose and is missing a clear, single table that documents the config options:

• CLI options
• config file structure

Feature / Enhancement Description

• Add a config table that documents each options and maps the CLI parameters to the config file structure. In other word it should be a single table for both.
• A CLI config should also be supported by the dashboard config file, but sometimes is isn't (yet). The table should provide that overview.
• Write a proper documentation for each parameter, instead of spreading bits all over code examples. In turn, much of the verbose examples and text can be removed from the README, unless a parameter requires its own section in the README.

Example Use Case

Option	Config File	Type	CLI Argument	Optional	Description
Application ID	apps[].appId	String	appId	no	The application ID. Must match the application ID set in Parse Server.

[parse-github-assistant]

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