Added markdown and refactor in evaluator

[Montagon]

This PR includes several changes:

1. Refactored the SuiteBuilder.kt file:

• Removed the file writing logic from the toHtml function. The function now returns an Html object instead of writing to a file.
• Removed the htmlFilename parameter from the toHtml function. The suite name is now passed as a parameter to the Html.get function.
• Added a toMarkdown function that returns a Markdown object.

2. Moved the Html.kt file from the output package to the models package and refactored the class:

• Changed Html from a regular class to a value class.
• The get function now returns an Html object instead of a String.
• Added a suiteName parameter to the get function.

3. Added a new Markdown.kt file in the models package:

• The Markdown class is a value class that holds a markdown-formatted string.
• The get function in the companion object generates a markdown-formatted string from a SuiteResults object and a suite name.