Drop support for model simulation configuration files in INI format in favor of JSON

[soaressgabriel]

Checklist

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Added tests for changed code.
• Updated documentation for changed code.

Description

• Remove *.ini from supported configuration files;
• Update doc pages to reflect changed code.

Related Issue

• Resolve Drop support for model simulation configuration files in INI format in favor of JSON #180.

Motivation and context

• See Redesign the structure of the model simulation configuration files in JSON format #126.

How has this been tested

• Manual testing was performed by executing RUBEM with provided sample dataset and verifying the output against expected results;
• Automated tests (unit and integration) must pass without exception.

Screenshots

• N/A

[LINAMARIAOSORIO]

LGTM