Improve Print Outputs

[mdapena]

Initial Checks

• The code compiles successfully without any errors or warnings.
• I have personally tested these changes on my local environment.
• I have ensured that relevant documentation has been added or updated.
• I adhere to the project structure and code standards defined in the documentation.
• My code follows the established coding style guidelines.
• I have added tests for the new code (if applicable).
• All existing tests have passed successfully.

Description

This PR enhances the print outputs of the Model and Term classes, improves the visibility of badges, and updates the configuration of the git-committers plugin for consistency.

• The print_info and print_solution methods in the Model class have been enhanced to improve visibility and provide deeper insights.
• The get_pretty_string method in the Term class has been refactored as an @abstractmethod for subclass customization.
• Badges on the main page of the documentation and the readme file have been updated to improve visibility and align with the package's color palette.
• The git-committers plugin in the mkdocs.yml file has been updated to exclude the index.md, examples/index.md, and api/index.md files for consistency in the current configuration with the git-revision-date-localized plugin.

[coveralls]

Pull Request Test Coverage Report for Build 8126231279

Details

• 3 of 3 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 8125264583:	0.0%
Covered Lines:	2611
Relevant Lines:	2611

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💛 - Coveralls